photosynthesis class 7 cbse

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Photosynthesis

Last Updated on July 3, 2023 By Mrs Shilpi Nagpal

Question 1 Define the term nutrition?

Question 2 Name any two modes of nutrition?

Question 3 Name the pores through which leaves exchange gases?

Question 4 What is photosynthesis?

Question 5 Why do organisms need food?

Question 6 Why green plants are called autotrophs?

Question 7 Name the green pigment present in the leaves of plants?

Question 8 “Human being cannot make their own food”? Explain?

Question 9 Why animals are called as heterotrophs?

Question 10 Explain the process of synthesis of food in green plants?

Question 11 State the conditions necessary for the process of photosynthesis to take place?

Question 12 What is the role of chlorophyll in green plants?

Question 13 Explain how the plants obtain Carbon Dioxide for making food by photosynthesis?

Question 14 Explain how, water and minerals are transported to the leaves of a plant to be used in food making by photosynthesis?

Question 15 What is the role of sunlight in photosynthesis?

Question 16 What is the importance of photosynthesis in life?

Question 17 Name foods made by plants which are important part of our diet?

Question 18 Why are algae green?

Question 19 Why leaves of certain plants are coloured?

☛ Also Read   NCERT Solutions for Chapter 1 Nutrition In Plants

• 1 Nutrition
• 2.1 Autotrophs: Autotrophic Mode of Nutrition
• 2.2 Heterotrophs: Heterotrophic Mode of Nutrition
• 3 Photosynthesis 
• 4 Conditions necessary for Photosynthesis
• 5 Leaves of Various Colours
• 6 Photosynthesis by Algae
• 7.1 (1) Plants Make Starch as food
• 7.2 (2) Plants Make Oils (or Fats) as Food
• 7.3 (3) Plants make Proteins as Food
• 7.4 (4) Plants make Vitamins as Food
• 8 Importance of Photosynthesis

The organisms need to take food

(1) To obtain energy (2) To obtain materials for growth and (3) To obtain materials for the repair of damaged parts of the body.

The process of taking food by an organism as well as the utilisation of this food by the organism is called Nutrition.

Plants can make their own food but animals can not make food themselves. Human beings and animals depend on plants for their food, directly or indirectly.

Modes of Nutrition

The methods of obtaining food are called modes of nutrition. On the basis of their modes of nutrition, all the organisms can be divided into two main groups:

(1) Autotrophs (2) Heterotrophs

Autotrophs: Autotrophic Mode of Nutrition

Those organisms which can make food themselves from simple substances (like carbon dioxide and water) by the process of photosynthesis, are called autotrophs (and their mode of nutrition is called autotrophic).

All the green plants are autotrophs because green plants can make their own food from simple substances like carbon dioxide and water present in their surroundings by the process of photosynthesis.

Autotrophs contain a green pigment called chlorophyll which helps them make food by absorbing energy from sunlight. The green plants produce food for non green plants as well as for animals.

Our body cannot make food from carbon dioxide and water present around us by the process of photosynthesis (like plants do) because our body does not have the green pigment called

chlorophyll. The green pigment chlorophyll is necessary to absorb energy from sunlight required for making food by photosynthesis.

Heterotrophs: Heterotrophic Mode of Nutrition

Those organisms which can not make food themselves by the process of photosynthesis and take food from green plants or animals, are called heterotrophs (and their mode of nutrition is called heterotrophic). All the non green plants and animals (including human beings) are heterotrophs. The non green plants called fungi are heterotrophs.

Photosynthesis 

The plants use the energy in sunlight to prepare food in the presence of a green colour matter called “chlorophyll” present in the leaves of a green plant.

The process by which green plants make their own food (like glucose) from carbon dioxide and water by using sunlight energy (in the presence of chlorophyll) is called photosynthesis.

Carbon dioxide  + Water → Glucose  + Oxygen

The process of photosynthesis takes place in the leaves of a plant. Oxygen gas is produced during photosynthesis which is utilised by all the living organisms for their survival.

(1) The process of photosynthesis first produces a simple carbohydrate called ‘glucose’ as food.

(2) The glucose carbohydrate then gets converted into a complex carbohydrate called Starch.

(3) Starch gets stored as food in the various parts of plant including leaves.

(4) Some of the glucose is also converted into other types of plant foods such as fats and oils, proteins as well as vitamins.

(5) The synthesis of food (or making of food) occurs in the leaves of a plant, so leaves are the food factories of a plant. The leaves of a plant can synthesise food because they contain a green pigment chlorophyll (which is necessary for making food). Other parts of a plant usually cannot synthesise food because they do not contain chlorophyll.

Conditions necessary for Photosynthesis

The presence of carbon dioxide, water, chlorophyll and sunlight is necessary for the process of photosynthesis to take place.

(1) How the plants obtain Carbon Dioxide for photosynthesis – The plants take carbon dioxide gas from air through the tiny pores (called stomata) present on the surface of leaves. Each pore is surrounded by a pair of guard cells. The opening and closing of stomatal pores in the leaves is controlled by the guard cells. The carbon dioxide gas present in air enters the leaves of a plant through the stomatal pores present on their surface and utilised in photosynthesis. The oxygen gas produced in the leaves during photosynthesis goes out into air through the same stomatal pores. The stomatal pores of leaves during photosynthesis goes out into air through the same stomatal pores. The stomatal pores of leaves open only when carbon dioxide is to be taken in or oxygen is to be released otherwise they remain closed.

(2) How the plants obtain water for photosynthesis – Water present in the soil is absorbed by the roots of a plant and then transported to the leaves through the vessels which run like inter-connected pipes throughout the roots, stem, branches and leaves. The tiny, pipe-like vessels which transport water from the roots of a plant to its leaves are called xylem.

The plants also need minerals to make foods other than carohydrates. The minerals dissolve in water present in the soil and get transported with it. Water and minerals present in the soil are absorbed by the roots of a plant and transported to its leaves through interconnected pipe like xylem vessels present throughout the roots, stem, branches and leaves of the plant.

(3) Role of chlorophyll in Photosynthesis – It is the presence of chlorophyll which makes the leaves look green. Chlorophyll can absorb the energy from sunlight. The sunlight energy absorbed by chlorophyll is used to combine carbon dioxide and water in the green leaves to produce food. Chlorophyll absorbs light energy from the sun and supplies this energy to the leaves to enable them to carry out photosynthesis for making food. Chlorophyll is present in every leaf of a plant in the form of hundreds of tiny structures called chloroplasts.

(4) The role of Sunlight in photosynthesis  – The sunlight supplies energy for the food making process called photosynthesis. The sun’s energy is captured by plant leaves with the help of chlorophyll and converted into chemical energy of food. This chemical energy gets stored in the form of plant food. So, when plants utilise the food made by photosynthesis, they actually use the solar energy stored in it in the form of chemical energy. Since all the food on this earth is made by utilising solar energy, therefore, sun is the ultimate source of energy for all the living organisms.

Leaves of Various Colours

Most of the plants have green coloured leaves. Some of the plants, however, have leaves of other colours such as red, violet, brown etc. The leaves having colours other than green also have chlorophyll in them. Actually, the large amount of red, violet, brown or other pigments in such leaves masks the green colour of chlorophyll. So, photosynthesis also takes place in leaves having colour other than green.

Photosynthesis by Plant Parts Other Than Leaves

In some plants, photosynthesis also takes place in other parts of plants such as “green stems” and “green branches. The green stems and green branches can do photosynthesis because they contain chlorophyll.

For example: The desert plants such as cactus have tiny, spine-like leaves to reduce the loss of water by transpiration. These tiny, spine-like leaves of a cactus plant cannot do photosynthesis. The stem and branches of a cactus plant are green which contain chlorophyll . So, the green stem and green branches of a cactus plant carry out the process of photosynthesis to make food for the plant.

Photosynthesis by Algae

We see patches of slimy, green layer floating on the surface of a pond or lake, or even in the stagnant parts of a river. This green layer is formed by the growth of tiny green plant-like organisms called algae .

Algae are a large group of simple, plant-like organisms. Algae contain chlorophyll and produce food by photosynthesis just like plants. Algae differ from plants because they do not have proper roots, stems and leaves. The green colour of algae is due to the presence of chlorophyll in them.

Synthesis of Food other than simple carbohydrate

The simplest food synthesised by the plants by photosynthesis is, a simple carbohydrate called glucose.

The glucose carbohydrate is made up of three elements : carbon, hydrogen and oxygen. The plants use the simple carbohydrate glucose to make many other foods such as starch, oils (or fats), proteins and vitamins.

(1) Plants Make Starch as food

Some of the simple carbohydrate glucose made by the plants through photosynthesis is converted naturally into a complex carbohydrate called starch. The starch is a food which is stored in various parts of a plant such as roots, stems, leaves and seeds.

The seeds or grains of wheat and rice have a lot of starch in them. Potato and carrot plants store a lot of starch in their roots.

(2) Plants Make Oils (or Fats) as Food

Certain plants convert the simple carbohydrate glucose made during photosynthesis into oils and store them in their seeds. Such seeds are called oil-seeds and give us oil (or fats) for cooking food.

For example: the seeds of sunflower plant contain a lot of oil stored in them.

We can extract oil from sunflower seeds and use it as a food. The oils obtained from plant seeds are commonly known as vegetable oil.

(3) Plants make Proteins as Food

Plants combine some of the glucose carbohydrate made during photosynthesis with nitrate minerals(obtained from soil) to make amino acids which are then made into proteins. In this way, plants make proteins as food.

Proteins are nitrogenous substances which contain nitrogen element

Nitrogen element is present in abundance in air in the form of nitrogen gas. However, the plants cannot absorb nitrogen gas for their needs. The soil has certain bacteria which convert nitrogen gas of air into nitrogen compounds (like nitrates) and release them into soil. Nitrates are the water soluble nitrogen compounds which are absorbed by the plants from the soil along with water. The plants fulfill their requirement of nitrogen.  The plants also obtain nitrogen from the nitrogen fertilisers.

(4) Plants make Vitamins as Food

Vitamins are made by plants. Vitamins are contained in vegetables, fruits and cereals made by plants.

Importance of Photosynthesis

Photosynthesis is important for the existence of life on this earth. 

(1) Photosynthesis by plants provides food to animals (including human beings): The survival of animals (including human beings) depends on the food made by plants by photosynthesis. In the absence of photosynthesis, there would be no plants on this earth and hence no animals will survive.

(2) The process of photosynthesis by plants puts oxygen gas into the air: 

It is this oxygen gas which the animals (including human beings) use for breathing and respiration. In the absence of photosynthesis, there would be no oxygen in air and hence no animals could exist on this earth.

About Mrs Shilpi Nagpal

Author of this website, Mrs. Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed. (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading free education to everyone. In addition to this website, author also has a Youtube channel, here is the link Class Notes Youtube Channel

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What is Photosynthesis?

Last updated at April 16, 2024 by Teachoo

Green plants make their own food (Carbohydrates) from Carbon dioxide and water in the presence of sunlight and chlorophyll. This process is called photosynthesis 

Steps of Photosynthesis

• Leaves have tiny pores called stomata . 
• These help take in carbon dioxide and give out oxygen .
• Green leaves have a colour pigment called chlorophyll . 
• It helps to capture the sunlight .
• The chlorophyll, carbon dioxide, sunlight and water help to synthesise food . This process is called photosynthesis
• Since sunlight is required for the process, it only occurs during the day .

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• Science CBSE
• Nutrition in plants
• Plants and their nutrition type

2. Photosynthesis in plants

• Plants take up carbon dioxide from the atmosphere through the tiny pores known as  'stomata present on the leaves' surface and surrounded by 'guard cells' .
• Plants absorb the  water  and minerals from the soil   with deep penetrated roots inside the ground and transport them through vessels to the other parts of the plants, including the leaves, where the synthesis of food takes place.
• The green pigment present in the leaves known as chlorophyll helps the plant's leaves capture the sunlight that acts as the source of energy to carry out the process.
• Through the process of photosynthesis , oxygen is released into the atmosphere during the synthesis of food.
• At the end of the photosynthesis, the produced energy is stored in the form of starch .
• Released oxygen will be used for the respiration of animals, including humans.
• Vessels are tube-like structures that run throughout the roots, stem, branches and leaves. These vessels are like tunnels carrying the nutrients through a continuous passage to the leaves.

• Most of the animals, including humans, depend on plants for their survival. And since plants require sunlight for their food production, we can say Sun is the ultimate source of energy for all living organisms.
• Photosynthesis isn't limited to leaves. It can also occur in green stems and branches.
• Desert plants, such as cactus, have adapted their leaves to form spines in order to minimise water loss by transpiration . These plants have green stems that can conduct photosynthesis.

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Important Questions for CBSE Class 7 Science Chapter 1 - Nutrition in Plants

• Class 7 Important Question
• Chapter 1: Nutrition In Plants

Boost Your Performance in CBSE Class 7 Science Exam Chapter 1 with Important Questions

This is a crucial chapter for students studying this subject as they can learn about the various ways in which nutrition can be beneficial for plants and animals. Class 7 is an extremely vital year for students because it is the first year of middle school for school kids. The topics covered during this year's syllabus is vital because it sets the idea for the upcoming years. Students will learn topics that will help set the groundwork for the 10th standard and help them in their later grades…

In this year's science subjects students will take a deep dive into chemistry, physics, and biology. Students during this chapter will study about nutrition and how it's beneficial for everyone. This text will go over the important topics in the chapter and therefore the essential questions for this chapter also. Students can learn easily using this text and study the way to score marks more easily in these subjects. Students got to prepare themselves for this subject because it can often be quite complex if students don't use any guidance. This article will help students get in their way around chapter1 class 7 science chapter 1.

Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. You can download NCERT Class 7 Science and Class 7 Maths NCERT Solutions to help you to revise the complete syllabus and score more marks in your examinations.

Important Topics Covered Under CBSE Class 7 Science Chapter 1 - Nutrition in Plants

Given below are the topics which the students will learn in CBSE Class 7 Science Chapter 1 - Nutrition in Plants:

Different Modes of Nutrition in Plants

Photosynthesis in Plants - How do the plants make food?

What are the other modes of nutrition in Plants?

What are Saprophytes?

Process of nutrition in the soil

Study Important Questions for Class 7 Science Chapter 1- Nutrition in Plants

A) very short answer questions (1 mark).

1. Fill in the blanks: 

i. The components essential for our body are called ____________. 

Ans: Nutrients 

ii. We obtain nutrients through ______________ . 

Ans : Food 

iii. Carbohydrates, _______________ and fats are important nutrients. 

Ans : Proteins 

iv.  ____________ can make their own food from simple nutrients. 

Ans: Plants/Autotrophs 

v. All animals are directly or indirectly _____________ on plants for food. 

Ans: Depend 

2.  State whether true or false. If false, correct the statement by changing the underlined word

a. Animals are the only organisms that can prepare their own food using simple substances from their surroundings. 

Ans: The given statement is false. Plants are the only organisms that can prepare their own food using simple substances from the surroundings. 

b. The intake of food by an organism is called nutrition. 

Ans: The given statement is true. 

c. Stomata absorb sunlight for photosynthesis. 

Ans: The given statement is false. Chlorophyll absorbs sunlight for photosynthesis. 

d. Insectivorous plants are autotrophic.  

Ans: The given statement is false. Insectivorous plants are partially heterotrophic. 

e.  Starch on reacting with iodine solution turns brown in color. 

Ans: The given statement is false. Starch on reacting with iodine turns blue-black in color. 

3. Define the following terms: 

a. Nutrition 

Ans : The process by which an organism receives and digests food to get the nutrients insoluble and simple forms is called Nutrition.

b. Autotrophs 

Ans: The organisms which can build their own food with the help of molecules like carbon dioxide gas and water from their surroundings with the assistance of sunlight and chlorophyll are called Autotrophs.

c. Photosynthesis 

Ans: The process by which organisms use sunlight to synthesize nutrients from carbon dioxide and water to create their own food is called Photosynthesis. In plants photosynthesis generally involves the green pigment called chlorophyll and generates oxygen as a secondary product.

d.  Host 

Ans: An organism that provides nourishment and/or shelters to some other organism is called a Host. The host supports and provides nourishment for the parasite (guest) and hence the host is negatively affected by this relationship. 

e. Parasite 

Ans: An organism that lives inside or on an organism of another species (its host) and which relies on the host for all the nutrients is called Parasite. The parasite is not able to survive without the host body.

B. Short Answer Questions (3 marks)

1. What are stomata? Explain their function. 

Ans: The tiny pores present on the underside of the leaf surface and surrounded by guard cells are called stomata. 

The functions of stomata include, 

Exchanging gases by the process called diffusion for photosynthesis and respiration. 

Transpiration of water i.e. the loss of excess water from the plant by evaporation of water from the upper surface of the leaf. 

2. How is sunlight used by the plant for photosynthesis? 

The main energy source for photosynthesis is sunlight. 

Sunlight is trapped by the green pigment chlorophyll which is present in all green parts of the plants including leaves. 

The energy of the sunlight converts water and carbon dioxide into a sugar called glucose. 

Glucose is used by plants for generating energy and to make other essential substances like cellulose and starch.

3. Why are some plants insectivorous? Give examples. 

Ans:  

Plants require nutrients like nitrogen in addition to carbohydrates for survival. 

In the places where there is a lack of nutrients, especially nitrogen, some plants fulfill their nitrogen requirements by digesting insects in order to absorb the necessary nitrogen. 

Examples of insectivorous plants include Venus flytrap, Utricularia, Drosera, Rafflesia, Pitcher plant, etc. 

4.  Explain the saprotrophic mode of nutrition with an example. 

Partial digestion of substrate outside the body and then absorbing the digested material into the body is called the saprotrophic mode of nutrition. 

With the saprotrophic mode of nutrition, the body releases digestive enzymes to the substrate which causes the partial breakdown of the substrate which later on gets absorbed by the body. 

Examples of organisms that follow a saprotrophic mode of nutrition include some detritivores such as fungi.

5. What is symbiosis? Explain with help of an example. 

Ans: Symbiosis is a relationship that exists between two organisms living in a close physical association which is mutually beneficial for both.

In this relationship, both organisms are equally benefited and no organism is affected by this relationship. These interactions last for a long term with the survival of both species.

Examples of organisms that follow symbiosis include lichen, mycorrhiza, etc.

C) Long Answer Questions (5 marks)

1. Explain how photosynthesis occurs in plants. 

The process by which organisms use sunlight to synthesize nutrients from carbon dioxide and water to create their own food is called Photosynthesis.

In this process, organic food like starch is synthesized by inorganic molecules like water and carbon dioxide.

The main energy source which is sunlight is trapped by the green pigment. 

Chlorophyll is present in all green parts of the plants including leaves.

The raw materials required are carbon dioxide and water where carbon dioxide is absorbed from the atmosphere and water is absorbed from the soil. 

The energy from sunlight enables a chemical reaction that converts carbon dioxide and water into glucose and oxygen. 

The overall chemical reaction during the process of photosynthesis can be represented as follows: 

$6\text{C}{{\text{O}}_{\text{2}}}\text{}+\text{}12{{\text{H}}_{\text{2}}}\text{O}\xrightarrow[\text{Chlorophyll}]{\text{Light}}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{12}}}{{\text{O}}_{\text{6}}}\text{  +  }6{{\text{O}}_{\text{2}}}\text{  }+\text{  }6{{\text{H}}_{\text{2}}}\text{O}$

$ \text{Carbon        water                    glucose      oxygen       water}   \text{dioxide} $

2. How are nutrients replenished in soil naturally? How can the nutrients be replenished artificially? 

The source of nutrients for the plants is soil. 

Plants receive nutrients from the soil which leads to depletion of nutrients in the soil. 

Plants are unable to use nitrogen gas directly from the atmosphere. Some bacteria convert nitrogen from the atmosphere into soluble compounds that can be used by plants. 

As they live in symbiotic association with the roots of leguminous plants, the nitrogen content is replenished in the soil by their actions. Nitrogen gets replenished in the soil naturally by using leguminous plants after cereal crops in the soil. 

In an artificial way, the nutrients can be replenished by using fertilizers and manure. 

3. How can we demonstrate that chlorophyll is necessary for photosynthesis?

Necessity chlorophyll can be demonstrated by carrying out an experiment on a variegated leaf. 

Before the start of the experiment, the outline of the leaf is traced on a piece of paper and the green areas are marked. 

To allow the process of photosynthesis, the leaf is placed in sunlight for some hours. 

The leaf is then boiled in alcohol so that it gets decolorized after which the iodine solution is added to the leaf. 

It can be observed in response to iodine solution the green areas of the leaf turn blue-black which indicates that the starch is present. 

Thus, through this experiment, it can be observed that photosynthesis occurs in the green areas of the variegated leaf which shows that chlorophyll is necessary for photosynthesis. 

4. How do plants obtain nutrients other than carbohydrates? 

Plants synthesize carbohydrates using energy from sunlight to convert carbon dioxide and water to glucose and further on into starch. 

The nutrients other than carbohydrates are obtained directly from the soil. 

The nitrogen content is replenished in the soil by the action of nitrogen-fixing bacteria. Nitrogen gets replenished in the soil naturally by using leguminous plants after cereal crops in the soil. Nitrogen compounds can be replenished in artificial ways by adding fertilizers and manure to the soil. 

Some insectivorous plants like the pitcher plant and Venus flytrap get their nitrogen requirements fulfilled by consuming insects. In this process, the insects are trapped and digested by the plant and the nutrients are released into the body of the plant. 

Class 7 Science Chapter 1 Important Questions- Free PDF Download

This chapter helps students to understand the various factors revolving around nutrition. Students will learn about the very basic functions of plants and how they retrieve nutrition through photosynthesis and carbon dioxide. All these functions help plants to grow more healthy and also help support the living beings around them. In this chapter, we will look into various functions of the plants and how they store and use their food to their benefit. Students will learn a great deal of this subject and also the various topics Lack of practice and a solid course plan and curriculum may act as a barrier preventing you from securing good scores and to urge a radical comprehension of all the essential concepts and topics under this chapter and break the barriers, students must enjoy the continuous practice. Regular practice of Chapter 1 class 7Important Questions can help students improve, become through the concepts and topics, and be efficient during preparation or revision. This article also provides class 7 science chapter 1 extra questions that can benefit students during their preparation of the subject. 

Class 7th Science Chapter 1 Important Concepts 

In this chapter, we will look into various concepts and some of these are explained down below. 

This chapter takes an intrinsic look into how the plants and how it functions in the world by using the right nutrition. The following are some of the topics covered in this chapter-

Stomata 

These are tiny pores found on the underside of the surface of the leaf and are surrounded by guard cells. They play a vital role by exchanging gases during the process of respiration and photosynthesis which in turn causes transpiration of water through evaporation from the leaf surface. 

Importance of Sunlight 

Sunlight is present for most of the time during the day and the plants are very efficient in using this as it is the energy source for the process of photosynthesis. The green pigment known as chlorophyll traps the sunlight which is present all over the plant. This sunlight is later converted into chemical energy. 

Saprotrophic Mode 

This mode is a partial digestion mode of the substrate outside the body wherein the digested material is absorbed into the body. In this mode of digestion, the plant releases digestive enzymes into the substrate. The partially digested substrate is then absorbed by the organism. We can see this type of digestion in fungi. 

Symbiosis 

This is a process where two organisms are mutually benefited. Here in this process, both the organism involved is not going to be harmed in any way and they are equally benefited. One organism could provide nutrition whereas the other organism could do it with some kind of shelter and protection. 

Photosynthesis 

The process where green plants convert solar energy into chemical energy is known as photosynthesis. Inorganic molecules like carbon dioxide and water are used to synthesize food like starch. The process starts off with the trapping of sunlight which is done by the chlorophyll present in green plants. Raw materials such as water and carbon dioxide are the prime ingredients for photosynthesis. Water is absorbed from the soil and carbon dioxide is taken from the atmosphere. The sunlight is the catalyst here in this process which converts the carbon dioxide and water into starch and oxygen. Starch is used up by the plant whereas the oxygen is left out to the atmosphere for other organisms to utilize.

Nutrients Being Replenished in the Soil Naturally 

Plants are constantly using the nutrients found in the soil for their own purpose and this in turn leaves the soil depleted of its nutrients. Nitrogen gas which is present in the atmosphere cannot be directly used by the plants. This nitrogen gas has to first be converted into soluble compounds and this can help plants to solve the later process. So this process is done by bacteria found in the soil and an example of this is Rhizobium. Rhizobium is found in the roots of leguminous plants.

The Process of Plants Receiving Nutrients Other Than Carbohydrates 

Raw materials such as water and carbon dioxide are the prime ingredients for photosynthesis. Water is absorbed from the soil and carbon dioxide is taken from the atmosphere. The sunlight is the catalyst here in this process which converts the carbon dioxide and water into starch and oxygen. Most of the other nutrients that are needed are obtained from the soil directly and this is obtained because of the nitrogen-fixing bacteria known as Rhizobium. There are many ways to obtain the nutrients and we will explore deeper in the chapter. 

Important Questions for Class 7 Science Chapter 1

Students here will learn a number of the essential elements in this chapter 1 of class 7. This may help them in their future grades because it sets the groundwork. Constant practice of the essential questions should help students to tackle any difficult questions in their final examinations the following are class 7th science chapter 1 important questions -

How do plants obtain nutrients other than carbohydrates?

How can we demonstrate that chlorophyll is essential for photosynthesis?

How are nutrients replenished in the soil naturally?

How can nutrients be replenished in the soil artificially?

What is symbiosis in plants? give an example.

Explain the saprotrophic mode of nutrition in plants

Why are some plants insectivorous? Give an example

How is sunlight used by the plant?

What are stomata? Explain their function.

Differentiate between autotrophic and heterotrophic nutrition.

Describe the role of enzymes in the digestion of food.

What are the components of a balanced diet? Explain their importance.

Discuss the harmful effects of malnutrition on the human body.

What is the importance of water in the diet of organisms?

Explain the process of respiration in plants and animals.

How do herbivores, carnivores, and omnivores obtain nutrition?

Benefits of Nutrition in Plants Class 7 Important Questions 

Students must understand the importance of this subject and what it holds for college kids of sophistication 9. By utilizing the important questions and with a rigorous practice regime students are going to be ready to score the foremost out of their exams. These exams are often a touch difficult without the proper guidance but by using this article students are going to be ready to study in a more structured manner.

The Following are the Advantages of Chapter 2 Science Class 9 Important Questions

It provides students with a structure with which they will study for his or her upcoming examinations.

This is a fundamental chapter for college kids and plays an important role in upcoming grades.

Students don’t need to worry about the relevance of these questions as they're all cross-checked and updated consistently with the newest CBSE guidelines and rules. therefore the information in this article is genuine and reliable.

Students can use this text to use their time wisely, it helps boost their confidence after consistent practice and students can plan their preparation accordingly.

Students can utilize and practice the important questions so that they can ace their examinations. 

Conclusion 

These essential questions on plant nutrition greatly benefit class 7 students. this pivotal chapter serves as a foundation for middle school science, enabling students to comprehend the fundamental aspects of nutrition. exploring topics like photosynthesis and carbon dioxide, this text empowers students to optimize their time, build confidence through consistent practice, and strategize their preparation. by familiarizing themselves with these important questions, students become aware of the chapter's diverse content and develop the skills to tackle challenging exam questions through dedicated effort..

FAQs on Important Questions for CBSE Class 7 Science Chapter 1 - Nutrition in Plants

Q1. Where can I find a repository of Important Questions for Class 7 Science Chapter 1 Nutrition in Plants?

Ans: Vedantu, a trustable ed-tech company, caters to a well-prepared repository of Important Questions for Class 7 Science Chapter 1 Nutrition in Plants as well as other chapters. Vedantu is known for its top-quality study materials and other resources like sample papers, important questions, etc. It selects these questions based on the exam pattern and most frequently asked questions. Vedantu provides a free PDF of Important Questions for Class 7 Science Chapter 1 Nutrition in Plants prepared by subject experts. These questions are also solved by subject matter experts to provide a clear cut understanding of the chapter. These are extremely helpful in exam preparation and boost scores.

Q2. How to make the most of Vedantu’s Important Questions for CBSE Class 7 Science Chapter 1 Nutrition in Plants to score well in exams?

Ans: Students can solve Vedantu’s important questions for Class 7 Science Chapter 1 Nutrition in Plants to score well in school exams. The extra questions provided by the e-learning platform for the first chapter of Class 7 Science can be utilized to understand what types of questions can students expect from the exam. These questions help learn concepts and practise the chapter. At Vedantu, the set of important questions are also solved by subject matter experts. By referring to the PDF file of important questions for Class 7 Science Chapter 1 Nutrition in Plants, students will be able to practice the chapter properly and will get an idea of important questions as well. The material can also be used at the time of the revision to get exposure to new questions.

Q3. Why should I practice extra questions for Class 7 Science Chapter 1 Nutrition in Plants?

Ans: Practising extra questions for CBSE Class 7 Science Chapter 1 Nutrition in Plants is crucial to score well in the exam. The important questions for Class 7 Science Chapter 1 Nutrition in Plants allow students to practice the chapter thoroughly. Working on these questions will not only make students familiar with all types of questions that can be asked in the exam, but it will also boost their confidence. The free PDF file of Important Questions for Class 7 Science Chapter 1 at Vedantu is designed to cover all the important topics of the chapters. These questions are based on the exam pattern and the necessary guidelines. These are added after referring to previous year question papers and must be downloaded to learn the chapter properly and score well.

Q4. What are some of the important questions for Class 7 Science Chapter 1 Nutrition in Plants?

Ans: Following are a few important questions for Class 7 Science Chapter 1 Nutrition in Plants:

How are nutrients replenished in soil naturally? How can the nutrients be replenished artificially?

How can we demonstrate that chlorophyll is necessary for photosynthesis?

Explain how photosynthesis occurs in pants.

What is symbiosis? Explain with the help of an example. 

Explain the saprotrophic mode of nutrition with an example.

Download the file to get more questions for the chapter and excel in exams.

Q5. What is Nutrition?

Ans: Nutrients are a source of nourishment required by living beings to grow (building tissues) and to produce energy. There are various other short questions and answers in the NCERT textbook for which you can find the answers in NCERT Solutions provided by Vedantu . You can also focus on the Important Questions as provided by Vedantu for an easygoing revision. The important questions cover all the key fundamentals that are vital from the perspective of the exam.

Q6. What is the importance of nutrients?

Ans: Nutrients are a basic requirement in both plants and animals and are found in various ways. They are the source of nourishment which makes them vital for survival. The importance of nutrients can be categorized into two factors:

Development: Plants require nutrients to grow from a sapling into a tree. They use the nutrients to produce food, energy, and photosynthesis.

Repair: Nutrients are the basic necessity for repairing broken tissues and replacing the dead ones.

Q7. How are plants useful for all?

Ans: Through the process of photosynthesis, plants give us oxygen and take in carbon dioxide. It is not only essential for the survival of all animals and humankind, but it also cleans the atmosphere. Various species of plants are our basic resource for several food crops and fibres. We cultivate crops, take fruits from plants, and process certain plants for materials like rubber. They help in maintaining the balance in the ecosystem. Hence, they are useful to all.

Q8. What are the raw materials required for photosynthesis?

Ans: Plants require water, carbon dioxide, and sunlight as raw materials to be able to do the process of photosynthesis. It is an important event for the conversion of carbon dioxide into oxygen and energy in the form of sugar for the preparation of food in plants. This is a process conducted only by the green plants that have chlorophyll. Hence chlorophyll and the raw materials are the basic requirements for photosynthesis to take place. 

Q9. What are the types of nutrition in plants?

Ans: Plants exhibit autotrophic and heterotrophic nutrition as two modes of nutrition. Autotrophic nutrition is when plants produce their own food using sunlight, water, and carbon dioxide. While certain plants and animals depend on other plants for nutrition which is known as heterotrophic nutrition. This is because not all plants contain chlorophyll which is a necessary part of photosynthesis. Chlorophyll is the green pigment that gives green colour to the plants. To study more about nutrition, students can download the Important Questions free of cost from the Vedantu website or mobile app.

Chapterwise Important Questions for CBSE Class 7 Science

Cbse study materials.

NCERT Books

NCERT Books for Class 7 Science PDF Download

NCERT Books Class 7 Science : The National Council of Educational Research and Training (NCERT) publishes Science textbooks for Class 7. The NCERT Class 7th Science textbooks are well known for it’s updated and thoroughly revised syllabus. The NCERT Science Books are based on the latest exam pattern and CBSE syllabus.

NCERT keeps on updating the Science books with the help of the latest question papers of each year. The Class 7 Science books of NCERT are very well known for its presentation. The use of NCERT Books Class 7 Science is not only suitable for studying the regular syllabus of various boards but it can also be useful for the candidates appearing for various competitive exams, Engineering Entrance Exams, and Olympiads.

NCERT Class 7 Science Books in English PDF Download

NCERT Class 7 Science Books are provided in PDF form so that students can access it at any time anywhere. Class 7 NCERT Science Books are created by the best professors who are experts in Science and have good knowledge in the subject.

NCERT Books for Class 7 Science – English Medium

• Chapter 1:  Nutrition in Plants

NCERT Solutions for class 7 Science

• Chapter 2:  Nutrition in Animals
• Chapter 3:  Fibre to Fabric
• Chapter 4:  Heat
• Chapter 5:  Acids, Bases and Salts
• Chapter 6:  Physical and Chemical Changes
• Chapter 7:  Weather, Climate and Adaptations of Animals of Climate
• Chapter 8:  Winds, Storms and Cyclones
• Chapter 9:  Soil
• Chapter 10:  Respiration in Organisms
• Chapter 11:  Transportation in Animals and Plants
• Chapter 12:  Reproduction in Plants
• Chapter 13:  Motion and Time
• Chapter 14:  Electric Current and its Effects
• Chapter 15:  Light
• Chapter 16:  Water: A Precious Resource
• Chapter 17:  Forests: Our Lifeline
• Chapter 18:  Wastewater Story

NCERT Solutions for class 7 Science PDF

NCERT Books for Class 7 Science – Hindi Medium

• अध्याय 1:  पादपों में पोषण
• अध्याय 2:  प्राणियों में पोषण
• अध्याय 3:  रेशों से वस्त्र तकग
• अध्याय 4:  ऊष्मा
• अध्याय 5:  अम्ल, क्षारक और लवण
• अध्याय 6:  भौतिक एवं रासायनिक परिवर्तन
• अध्याय 7:  मौसम, जलवायु तथा जलवायु के अनुरूप जंतुओं द्वारा अनुकूल
• अध्याय 8:  पवन, तूफ़ान और चक्रवात
• अध्याय 9:  मृदा
• अध्याय 10:  जीवों में श्वसन
• अध्याय 11:  जंतुओं और पादप में परिवहन
• अध्याय 12:  पादप में जनन
• अध्याय 13:  गति एवं समय
• अध्याय 14:  विधुत और इसके प्रभाव
• अध्याय 15:  प्रकाश
• अध्याय 16:  जल: हमारी जीवन रेखा
• अध्याय 17:  वन: हमारी जीवन रेखा
• अध्याय 18:  अपशिष्ट जल की कहानी

NCERT Books for Class 7 Science – Urdu Medium PDF Download

The NCERT syllabus mainly focuses on this book to make it student-friendly to make it useful for both the students and the competitive exam aspirants. The book covers a detailed Science based on the syllabuses of various boards. NCERT Science Books for Class 7 is perfectly compatible with almost every Indian education state and central boards.

We hope that this detailed article on NCERT Books Class 7 Science helps you in your preparation and you crack the Class 7 exams or competitive exams with excellent scores.

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NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12

Nutrition in Plants Class 7 Extra Questions Science Chapter 1

June 1, 2019 by Bhagya

Nutrition in Plants Class 7 Science Extra Questions Very Short Answer Type

Question 1. Potato and ginger are both underground parts that store food. Where is the food prepared in these plants? [NCERT Exemplar] Anwer: In both the plants, shoot system and leaves are above ground. They prepare food through photosynthesis and transport it to the underground part for storage.

Question 2. Plants prepare their food using a different mode of nutrition than us. What is it? Answer: The mode of nutrition in plant is autotrophic, i.e. they synthesise their own food.

Question 3. Photosynthesis requires chlorophyll and a few other raw materials. Add the missing raw materials to the list given below: Water, minerals, (a) …… (b) ……. Answer: (a) Sunlight (b) Carbon dioxide

Question 4. The tiny openings present on the leaf surface. What are they called? Answer: Stomata are the tiny pores present on the surface of leaves through which gaseous exchange takes place in plants.

Question 5. What is the function of guard cells of stomata? Answer: Guard cells help in controlling the opening and closing of stomata for gaseous exchange.

Question 6. Which parts of the plant are called food factories of the plant? Answer: Leaves are referred to as food factories of plants. This is because, leaves synthesise food by the process of photosynthesis.

Question 7. A carbohydrate is produced by plants as food source. It is constituted from which molecules? Answer: Carbohydrates are composed of carbon, hydrogen and oxygen.

Question 8. Why do some plants feed on insects? Answer: Insectivorous plants grow in soil which lack nitrogen, therefore they eat insects to fulfill their need of nitrogen.

Question 9. Define parasites. Answer: Parasites they are those organisms which grow on other plants or animals for their food, e.g. Cuscuta.

Question 10. Name the bacteria that can fix atmospheric nitrogen. Answer: Rhizobium is the bacterium which can fix atmospheric nitrogen.

Question 11. Except plants, why can’t other living organisms prepare their food using CO 2 , water and minerals? [HOTS] Answer: Our body does not contain chlorophyll for absorbing solar energy which is necessary for preparing food using air, water, etc.

Question 12. A leguminous plant can restore the soil’s concentration of mineral nutrients. Can you give examples of some such plants? Answer: Plants such as gram, pulses and beans are leguminous.

Question 13. Algae are green in colour. Why? Answer: Algae contain chlorophyll which imparts green colour to them.

Question 14. what do you understand by nutrition? Answer: The process of utilising nutrients like carbohydrates, proteins, fats, etc., to generate energy is called nutrition.

Question 15. Fungus can be harmful and useful. Give an example showing both of these traits of fungus. Answer: Fungus produces antibiotics like penicillin used to treat diseases and fungus can also harm us by causing fungal infections on skin and hair.

Question 16. A unique feature in leaves allows them to prepare the food while other parts of plants cannot. Write the possible reason for this. [HOTS] Answer: Leaves contain chlorophyll which is essential for food preparation and is absent in other parts of plant.

Question 17. Algae and fungi form a unique association sharing benefits from each other. What is the name of association between them? Answer: Lichens.

Question 18. In a plant, photosynthesis occurs in a part other than leaf. Name that plant and the part where photosynthesis occurs. Answer: Cactus, the part where photosynthesis occurs are stem and branches which are green.

Question 19. Why is Cuscuta, categorised as a parasite? Answer: Cuscuta derives its nutrition using an association where it deprives its host of all valuable nutrients and absorbs them itself. Hence, it is called a parasitic plant.

Question 20. Plant cannot use the nitrogen present in the soil directly. Why? Answer: Plants can use nitrogen only in soluble form while in soil nitrogen is present in inorganic form.

Question 21. Why are insectivorous plants called partial heterotrophs? Answer: Insectivorous plants are autotrophs, i.e. they prepare their own food. They are partial heterotrophs as they eat insects for obtaining nitrogen.

Question 22. What is the stored food form in sunflower seeds? Answer: In sunflower seeds, glucose is stored in the form of oils (fats).

Question 23. What do you understand by saprotrophic mode of nutrition? Answer: The mode of nutrition in which organisms take their nutrients from dead and decaying matter is called saprotrophic mode of nutrition.

Question 24. A mutually beneficial relationship that occurs between two plants. It is known by what name? Give an example. Answer: Symbiosis is the mutually benefitting association between two plants, e.g. lichens.

Question 25. For testing the presence of starch in leaves, a boiled leaf is used. Why? Answer: Boiling the leaf remove chlorophyll/green colour from the leaves.

Question 26. Mosquitoes, bed bugs, lice and leeches suck our blood. Can they be called as parasites? [HOTS] Answer: Yes, these animals/insects are parasites as they harm the hosts while they suck blood.

Question 27. Insectivorous plants have one or the other specialised organs to catch their prey. What is that organ? Answer: Leaves of insectivorous plants catches the prey.

Question 28. Farmers spread manure of fertilisers in the field or in gardens, etc. Why are these added to the soil? Answer: Plants absorb mineral nutrients from soil. Thus, declining their concentration in soil fertilisers and manures enhance or add these essential nutrients back in soil.

Question 29. A cell is formed of many sub-components. Identify different constituents of the cell. Are animal and plant cells similar? Answer: A cell contains nucleus, cytoplasm, vacuole, cell organelles like chloroplast, mitochondria, etc. No, animal cells are different from plant cells.

Question 30. A goat eats away all the leaves of a small plant (balsam). However, in a few days, new leaves could be seen sprouting in the plant again. How did the plant survive without leaves? [NCERT Exemplar; HOTS] Answer: The plant of balsam survived on the food stored in the stem and roots.

Nutrition in Plants Class 7 Science Extra Questions Short Answer Type

Question 1. Different modes of nutrition has been observed in plants. What are they? Give example of each. Answer: Plants show two major modes of nutrition, i.e. (i) Autotrophs are those which can synthesise their own food. (ii) Heterotrophs are those which are dependent on other plants and animals for their food. They are of following types: (a) Parasites, e.g. Cuscuta (b) Saprotrophs, e.g. fungi.

Question 2. Sunlight, chlorophyll, carbon dioxide, water and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials. (a) Available in the plant: ……… (b) Available in the soil: ……… (c) Available in the air: ……… (d) Available during day : ……… [NCERT Exemplar] Answer: (a) Available in the plant: chlorophyll (b) Available in the soil : water, minerals (c) Available in the air : carbon dioxide (d) Available during day : sunlight

Question 3. Plants are considered an essential part of earth as they keep a check on lot of process occurring all over. What would happen if all the green plants are wiped from earth? [HOTS] Answer: Green plants are the source of energy for all the living organisms so that they can perform their normal functions. If all green plants and trees disappear, all the organism depending on them for food and shelter will also die.

The lack of gaseous exchange will lead to increase in amount of CO 2 , causing death in humans and other animals also. The cycle of life will gradually disappear.

Question 4. Autotrophs and heterotrophs are two different organisms with distinct modes of nutrition state. How are they different from each other? Answer: The difference between autotrophs and heterotrophs are as follows:

Question 5. Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason. [NCERT Exemplar; HOTS] Answer: Carbohydrates in wheat dough encourage the growth of yeast and other saprophytic fungi which breakdown carbohydrates into simpler compounds like CO 2 and alcohol and emit a foul smell.

Question 6. What are the various raw materials for photosynthesis? Answer: Plants utilise carbon dioxide from air and water and minerals are derived from soil (through roots) as raw material for photosynthesis. Besides these chlorophyll present in green leaf is necessary for the process and sunlight is the source of energy which is converted into chemical energy during the process of photosynthesis.

Question 8. Nitrogen is an essential nutrient for plants growth. But farmers who cultivate pulses as crops like green gram, bengal gram, black gram, etc., do not apply nitrogenous fertilisers during t cultivation. Why? [NCERT Exemplar; HOTS] Answer: Roots of pulses (leguminous plants) have a symbiotic association with a bacterium called Rhizobium. This bacteria convert gaseous nitrogen of air into water soluble nitrogen compounds and give them to the leguminous plants for their growth. Hence, farmers need not use nitrogenous fertilisers.

Question 9. Pooja is worried about her new shoes which she wore on special occassions that they were spoiled by fungus during rainy season. Is she right to worry, if yes, then tell why does fungi suddenly appears during the rainy season? [HOTS] Answer: Yes, the fungi reproduces by spores which are generally present in the air and grow on any article that are left in hot and humid weather for a long time. During rainy season they land on wet and warm things and begin to germinate and grow.

Question 10. In what unique manner does a pitcher plant derive its nutrition? Answer: Nepenthes or pitcher plant modifies its leaf axis into a long tubular pitcher to form a pitfall trap. Inside the pitcher sticky liquid is present. When any insect comes in contact with the leaf, the lid present on it is closed and insect is trapped. The liquid contains digestive enzymes which slowly digest the trapped insects.

Question 11. Water and minerals are absorbed by the roots and then transported to leaves. How? Answer: Water and minerals are transported to the leaves by the vessels which run like pipes throughout the root, stem, branches and the leaves. These vessels are xylem and phloem, forming a continuous path or passage for the nutrients to make them reach the leaf.

Question 12. Some plants have deep red, violet or brown coloured leaves. Can these leaves perform the photosynthesis process? [HOTS] Answer: Yes, plants having deep red, violet or brown coloured leaves can also carry out photosynthesis because they contain chlorophyll. But their green colour of chlorophyll is masked by the large amount of all other coloured pigments.

Question 13. If plant has a requirement for nitrogen, then from where will they obtain it? Answer: Soil contains nitrogen in the form that is not usable by plants. Bacteria like Rhizobium converts nitrogen into soluble form that can be easily used by plants. So, if plant has a requirement for nitrogen, then it will obtain that which the help of bacteria.

Question 14. In the absence of photosynthesis, life would be impossible on earth. Is it true or false? Answer: True, because photosynthesis is important for the existence of life on the earth. Photosynthesis is important process as it is provides food to all living organisms and maintains CO 2 – O 2 balance of nature.

Nutrition in Plants Class 7 Science Extra Questions Long Answer Type

Question 2. Describe the method for replinishing the soils with minerals and other essential constituents used by plants growing in those soil by farmers. Answer: Replenishment of Nutrients in Soil

Crops require a lot of nitrogen to make proteins. After the harvest, the soil becomes deficient in nitrogen. Plants cannot use the nitrogen gas available in atmosphere directly. Action of certain bacteria can convert this nitrogen into form readily used by plants. Rhizobium bacteria live in the root nodules of leguminous plants. These bacteria take nitrogen gas from the atmosphere and convert it into water soluble nitrogen compounds making it available to the leguminous plants for their growth.

In return, leguminous plants provide food and shelter to the bacteria as Rhizobium cannot prepare its food. They, thus have a symbiotic relationship. This association is very important for the farmers, as they do not need to add nitrogen fertilisers to the soil in which leguminous plants are grown.

Question 3. Harish went to visit his grandfather in village where he saw that his grandfather’s field of wheat are infected with fungus but no one is aware of this. Harish rushed to his grandfather’s side and told him that the field have been infected with fungi. He should use an antifungal agent in his fields to stop this infection. (a) What is fungus? (b) Can fungus only cause diseases or can it be helpful also? (c) What values are shown by Harish? [Value Based Question] Answer: (a) Fungus are saprophytic organisms usually present as spores in atmosphere which can germinate on any substrate in optimal conditions. (b) Fungus are also useful in that they produce many antibiotics which can cure different types of infections like penicillin. (c) Harish is sincere, curious and knowledgeable with a keen sense of applying it where necessary.

Question 4. Wild animals like tiger, wolf, lion and leopard do not eat plants. Does this mean that they can survive without plants? Can you provide a suitable explanation? [HOTS] Answer: Animals like tiger, wolf, lion and leopard are carnivores and do not eat plants. They hunt and eat herbivorous animals like deer, gaur, bison, zebra, giraffe, etc., which are dependent on plants for food.

If there are no plants, herbivorous animals will not survive and ultimately animals like tiger, wolf, lion and leopard will have nothing to eat.

Question 5. Asha went to visit her grandfather in his village. He was having a serious discussion with his fellow members regarding the productivity level of crops for present year. They all were worried about how to increase the productivity of crop Asha listened to this and then suggested to the group that the reason may be decreased level of minerals in soil. She told her grandfather to plant crops like pulses, gram, beans, etc., for a year then follow with regular crops. This will increase the crop productivity? (a) What will you name the process suggested by Asha? Why is there decrease in crop productivity? (b) What are noted benefits of this process? Will the results be as what Asha expressed? (c) What values are shown by Asha? [Value Based Question] Answer: (a) This process is known as crop rotation. All the plants/crops grown in soil use the minerals present in soil for their own use. This continuous usage depletes the concentration of mineral in soil. (b) After growing leguminous plants, the mineral content of soil is restored and enriched to new level. Yes, the benefit of leguminous plant is the re-enrichment of soil minerals. (c) Asha is observant, sincere and interested in applying her knowledge to situations.

Nutrition in Plants Class 7 Science Extra Questions Miscellaneous

Multiple Choice Questions

Question 1. Organisms which prepare food for themselves using simple naturally available raw materials are referred to as [NCERT Exemplar] (a) heterotrophs (b) autotrophs (c) parasites (d) saprophytes Answer: (b) autotrophs

Question 2. In the process of photosynthesis, which of the following energy conversions occur? (a) Solar energy is changed into chemical energy. (b) Solar energy is changed into mechanical energy. (c) Bioenergy is converted into chemical energy. (d) Chemical energy is changed into light energy. Answer: (a) Solar energy is changed into chemical energy.

Question 3. The raw material used by plants during photosynthesis (a) N 2 and O 2 (b) O 2 , H 2 and CO 2 (c) CO 2 and water (d) water and minerals Answer: (c) CO 2 and water

Question 4. Which of the following statements is/are correct? (i) All green plants can prepare their own food. (ii) Most animals are autotrophs. (iii) Carbon dioxide is not required for photosynthesis. (iv) Oxygen is liberated during photosynthesis. choose the correct answer from the options below: [NCERT Examplar] (a) (i) and (iv) (b) only (ii) (c) (ii) and (iii) (d) (i) and (ii) Answer: (a)  (i) and (iv) are correct statements and (ii) and (iii) are incorrect. Because (ii) animals are heterotrophs and (iii) CO 2 is necessary for photosynthesis. Green plants prepare their own food from CO 2 and H 2 O.

Question 5. The symbiotic association is seen in which of the following? (a) Lichens (b) Algae (c) Fungi (d) Bacteria Answer: (a) Lichens

Question 6. Pitcher plant traps insects because it (a) is a heterotroph (b) grows in soils which lack in nitrogen (c) does not have chlorophyll (d) has a digestive system like human beings Answer: (b) grows in soils which lack in nitrogen

Question 7. Insectivorous plant among the following is (a) lichen (b) Cuscuta (c) pitcher plant (d) bread mould Answer: (c) pitcher plant

Question 8. In the plant of cactus leaves are modified into (a) branches (b) spines (c) leaf vein (d) pitcher Answer: (b) spines

Question 9. If iodine is dropped on the boiled leaf it gives blue-black colour due to the presence of (a) starch (b) protein (c) fat (d) vitamin Answer: (a) starch

Question 10. When we observe the lower surface of a leaf through a magnifying lens, we see numerous small openings. Which of the following is the term given to such openings (a) Stomata (b) Lamina (c) Midrib (d) Veins Answer: (a) Stomata

Question 11. Two organisms are good friends and live together. One provide? shelter, water and nutrients while the other prepares and provides food. Such an association of organisms is termed as (a) saprophyte (b) parasite (c) autotroph (d) symbiosis Answer: (d) symbiosis

Question 12. In the process of photosynthesis, plants (a) take O 2 and release CO 2 (b) take CO 2 and release O 2 (c) take and release O 2 (d) take O 2 and release water Answer: (b) take CO 2 and release O 2

Question 13. Which of the following raw material is available in the air for photosynthesis? [NCERT Exemplar] (a) Oxygen (b) Carbon dioxide (c) Nitrogen (d) Hydrogen Answer: (b) Carbon dioxide

Question 14. The ultimate source of food on earth is (a) plants (b) sunlight (c) animals (d) proteins Answer: (a) plants

Question 15. Farmers use manure and fertilisers to (a) replenish plant (b) replenish soil (c) replenish air (d) replenish fungi Answer: (b) replenish soil

Fill in the Blanks

Question 1. The association where two participating plants mutually benefit each other is called ……. Answer: symbiosis

Question 2. ……. plants derive their nutrient from dead and decaying animals or plants. Answer: Saprophytic

Question 3. The openings present on the surface of leaves are protected by cells called ……. Answer: guard cells

Question 4. Leaves are called the ……. of plants. Answer: food factory

Question 5. All green plants possess ……. in their leaves. Answer: chlorophyll

Question 6. Cuscuta is a ……. plant. Answer: parasitic

Question 7. The plants that provide nutrition to the parasitic plant are called ……. Answer: host

Question 1. Food is necessary for plants only. Answer: False, food is necessary for all the living organisms as all of them grow and require maintenance from time to time

Question 2. Animals are heterotrophs. Answer: True

Question 3. Cells are called building block of a body. Answer: True

Question 4. Chlorophyll is present in an animal cell. Answer: False, chlorophyll is present in leaf of plants not in animal cells.

Question 5. Fungi are green plants that can synthesise their own food. Answer: False, fungi are not green and they are not classified as plants. They are saprophytic organisms which derive nutrition from dead and decaying matter.

Question 6. Pitcher plant eats insects. Answer: True

Question 7. Lichen is a saprophytic plant. Answer: False, lichen is a symbiotic association between an alga and a fungi. It is not a plant.

Question 8. Rhizobium can fix atmospheric nitrogen into nitrogen compound. Answer: True

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CBSE 10th, 12th Compartment Exam 2024 Time Table Out, Registration Open till June 15; Check Dates Here

Ankita Garkoti

Content Curator | Updated On - Jun 9, 2024

CBSE Class 10th, 12th supplementary exam schedule released. Candidates must register at cbse.gov.in by June 15 without any late fee. The supplementary exam is scheduled from June 15.

New Delhi: The Central Board of Secondary Education (CBSE) has released the tentative timetable for CBSE Class 12th and 10th compartment exams . As per the schedule, the supplementary exams will be held from July 15, 2024 in all CBSE-affiliated schools.

Students who did not pass the board examinations this year can register for the CBSE Class 10th and CBSE Class 12th supplementary exams through the official CBSE website at cbse.gov.in. The last date to register for compartment exams is June 15, 2024 with a registration fee of INR 300. A late registration window will be open from June 16 to June 17, 2024, with an additional fee of INR 2000.

The CBSE will conduct the supplementary exams to ensure that students have another opportunity to clear their board exams and continue their academic progress without significant delay. Students are encouraged to complete the registration process promptly to avoid late fees.

What is the CBSE Class 10 Supplementary Exam Time Table 2024?

Check the detailed exam schedule for CBSE Class 10th Supplementary Exam 2024 in the table below:

What is the CBSE Class 12th Supplementary Exam Schedule 2024?

Check the detailed schedule for class 12th supplementary exams:

CBSE Class 12 Compartment Exam Date Sheet 2024

The exam for language papers will be conducted on July 15, 2024 in two different shifts. Check the shift wise time table below:

Frequently Asked Questions

Ques. Who is eligible to register for CBSE Class compartment exams?

Ans. Candidates who have failed in one subject in CBSE Class 10th, 12th board exams 2024 can apply. Students who failed in two or more subjects are not eligible and must reappear for the entire board exam next year.

Ques. What is the CBSE Class 10th, 12th compartment exam 2024 exam pattern?

Ans. The exam pattern will be the same as in CBSE class 10th, 12th board exam.

Ques. What is the release date for CBSE Class 10th, 12th compartment results 2024?

Ans. The CBSE Class 10th and 12th compartment exam results will be out in August 2024.

Latest CBSE Updates:

• CBSE Results 2024: Board Issues Advisory to Schools Over Marked Differences in Practical and Theory Marks 
• CBSE Supplementary Exam 2024 Forms Released, Apply for Compartment, Improvement Exams by June 15

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PRSU Result 2024: Pandit Ravishankar Shukla University (PRSU) has released the examination results of various undergraduate and postgraduate c...

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Durg University Result 2024 has been released for B.Sc., B.Ed. Examinations on June 08, 2024 at the official website (durgunive...

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NCERT Class 7 English Book Chapter-wise

The NCERT Class 7 Books provide students with the best study resource for exam preparations, and they can score good marks in the annual examinations by referring to them. Moreover, these NCERT books can be used for a thorough understanding of topics and concepts which are covered under the syllabus of CBSE.

We, at BYJU’S, provide NCERT Books for CBSE Class 7 for all subjects. The whole book can be downloaded, while some individual chapters can also be read on BYJU’S website or using BYJU’S – The Learning App. In addition, students will be able to benefit a lot from the model question papers and sample papers that come as part of NCERT Solutions .

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