CBSE Class 7 Science Nutrition In Plants Worksheet

Learn and write the following questions and answers.

Question 1: What are the components of food?
Answer: Carbohydrates, proteins, fats, vitamins and minerals are the components of food.

Question 2: What is nutrition?
Answer: The process of utilization of food by a living organism to obtain energy is called nutrition.

Questions 3: What is autotroph?
Answer: Organisms that make their food themselves are called autotrophs.

Question 4: What is autotrophic mode of nutrition?
Answer: The mode of nutrition in which the organism makes its own food is called autotrophic mode of nutrition.

Question 5: Give some example of autotrophs.
Answer: All green plants, such as grass, mango, bougainvillea, etc. are the examples of autotrophs. Some bacteria also show autotrophic nutrition.

Question 6: What is heterotrophic mode of nutrition?
Answer: The mode of nutrition in which an organism takes food from another organism is called heterotrophic mode of nutrition. The nutrition in animals and non-green plants is the example of heterotrophic mode of nutrition.

Question 7: Give examples of Heterotrophs.
Answer:Animals and non green plants are the examples of heterotrophs.

Question 8: What are saprotrophs?
Answer:Organisms which get their nutrition from dead or decaying plants in liquid form are called saprotrophs.

Question 9: What is the ultimate source of energy?
Answer: Sun is the ultimate source of energy.

Question 10: Why do farmers add nitrogenous fertilizers to the soil?
Answer: Farmers add nitrogenous fertilizers to the soil to fulfill the requirement of nitrogen of the plants. Nitrogen is necessary to synthesize proteins.

1.If the pitcher plant is green and carries out photosynthesis then why does it feed on insects?

2.Which of the following part/s of a desert plant perform the function of photosynthesis?

(A) Leaves.

(B) Stem.

(C) Both (a) and (b).

(D) None of these.

3.The green coloured pigment in the leaves is-

(A) Chlorophyll.

(B) Anthocyanin.

(C) Protoplast.

(D) Chloroplast.

4.Which of the following is a parasitic plant?

(A) Cuscuta

(B) Algae

(C) Pitcher plant

(D) Lichen

5.Saprophytic mode of nutrition is found in-

(A) Lichens.

(B) Pitcher.

(C) Mushroom.

(D) Cuscuta.

6.Which of the following is the function of stomata?

(A) Carbon dioxide enters the leaf through stomata.

(B) Nitrogen discharges into the atmosphere from the leaf through stomata.

(C) Food material synthesised in the leaf is discharged into the atmosphere from the leaf through

stomata.

(D) Oxygen enters the leaf through stomata.

7.Which of the following raw material is not necessary for photosynthesis?

(A) CO2

(B) H2O

(C) Sunlight

(D) Nitrogen

8.Name a plant that has both autotrophic as well as heterotrophic mode of nutrition.<

9.Name the pores through which leaves exchange gases.

10.What is a lichen?

11.Which of the following statement is false?

(A) Green plants are autotrophs.

(B) Photosynthesis takes place mostly in green leaves which contain green pigment, chlorophyll inside

chloroplasts.

(C) Non-green plants and animals are heterotrophs.

(D) Photosynthesis does not take place in deep red, violet or brown leaves.

12.Which of the following is not true about saprophytic plants?

12.Which of the following is not true about saprophytic plants?
(A) These plants are green in colour.
(B) These plants are commonly seen during and after rain.
(C) Yeast shows saprophytic mode of nutrition.
(D) These plants secrete digestive juices on the dead and decaying organic matter.

13.Pitcher plant is green in colour but it eats insects to complete the requirement of-
(A) Water.
(B) Carbon dioxide.
(C) Nitrogen.
(D) Oxygen.

14.Why our body cannot make food from carbon dioxide , water and minerals like plants do? <$>
<What is so special about the leaves that they can synthesize food a=but other parts of the plant cannot

15.Why our body cannot make food from carbon dioxide , water and minerals like plants do?

16.The bacterium calledcan take atmospheric nitrogen and convert it into a soluble form called

17.During photosynthesis plants take in .............. and release.................

18.In photosynthesis solar energy is captured by the pigment called

19.Green plants are called since they synthesise their own food.

20.Why fungi have a different mode of nutrition ?

21.Why insectivorous plants eat insects ?

22.Why only plants can make their food ?

23.Why all living organisms require food ?

24.What is the stored form of carbohydrates in plants?

25.During photosynthesis, carbohydrates get converted to-
(A) Proteins.
(B) Starch.
(C) Carbohydrates.
(D) All of them.

26.Identify 'X' in the following reaction :
CO₂+Water light/chorophyll X + Oxygen
(A) Vitamin.
(B) Protein.
(C) Carbohydrate.
(D) Minerals.

27.Why in the rainy season does a loaf of bread turn blue, brown or greenish?

28.In lichen, which of the following is autotrophic?
(A) Algal partner.
(B) Fungal partner.
(C) Both (a) and (b).
(D) None of these.

29.Slimy green patches are formed in ponds by-
(A) Fungi.
(B) Algae.
(C) Bacteria.
(D) Lichens.

30.Living organisms are made up of tiny units called-
(A) Nucleus.
(B) Cell.
(C) Cytoplasm.
(D) Cell membrane.

31.Which of the following does not help in providing nitrogen to the soil?
(A) Peas
(B) Gram
(C) Beans
(D)Wheat

32.Which of the following requires nitrogen for its synthesis?
(A) Carbohydrates
(B) Proteins
(C) Fats
(D) Vitamins

33.Two different organisms living together and both benefitted from each other, are known as-
(A) Saprophytic.
(B) Symbiotic.
(C) Parasitic.
(D) Heterotrophs.

34.Photosynthesis is a-
(A) Natural process.
(B) Chemical process.
(C) Natural chemical process.
(D) Physical process.

35.Which of the following season provides ideal conditions for a fungi to grow?
(A) Cold weather.
(B) Rainy season.
(C) Hot and humid weather.
(D) Both (B) and (C).

36.Which of the following is correct?
(A) Fungi like yeast and mushrooms are useful.
(B) Some fungi cause diseases in plants.
(C) Some fungi are also used in medicines.
(D) All of these.

37.Stomata is surrounded by-
(A) Guard cells.
(B) Chlorophyll.
(C) Carbohydrates.
(D) None of them.

38.Which one of the following organisms is a producer?
(A) Yeast.
(B) Cow.
(C) Grass.
(D) Paramecium.

39.Farmers need to add nitrogenous fertilizers to the soil in which-
(A) Moong beans are grown.
(B) Peas are grown.
(C) Gram is grown.
(D)Wheat is grown.

40.Which of the following is a false statement?
(A) Rhizobium can take atmospheric nitrogen and convert it into a soluble form.
(B) Though nitrogen gas is available in plenty in the air, plants cannot use it in the manner they can use carbon dioxide.
(C) Plants need nitrogen in a soluble form.
(D) Rhizobium feed on atmospheric nitrogen.

41.Match the given terms in list I with their definitions in list II:
I. Nutrition       A. Organism deriving its food from dead and decaying plants and animals.
II. Parasite       B. Association of two different organisms in which both are benefitted.
III.Saprophyte  C. Process of obtaining and utilising food.
IV. Symbiosis    D. Organism that derives its food from the living body of another organism.
(A) I-B, II-C, III-D, IV-A
(B) I-C, II-D, III-A, IV-B
(C) I-D, II-A, III-B, IV-C
(D) I-A, II-B, III-C, IV-D

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42.What is Autotrophic nutrition? Give example of autotrophs.

43.Write chemical equation of photosynthesis

44.How are nutrients replenished in the soil?

45.Why does the pitcher plant feed on insects though it is green?

46.What do you mean by Heterotrophs?

47.What are nutrients?

48.How do fungi appear suddenly during the rainy season?

49.What are autotrophs ?

50.What are cells ?

51.How do plants prepare their own food?

52.How would you test the presence of starch in leaves?

53.Define nutrition.

54.Why do organisms need to take food?

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55.What is the difference between a parasite and a saprotroph? Give example.

56.What is photosynthesis?

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57.Why are leaves called the food factories of plants? Explain.

Q1 Define Nutrients?

Q2 Why do organisms need to take food?

Q3 What are the essential components of food?

Q4 What are the different modes of nutrition. Explain by making the flow chart?

Q5 Why our body cannot make food from carbon dioxide and water like plants?

Q6 What is the ultimate source of energy for all the living organisms?

Q7 Which organ is known as food factories of the plant. Why?

Q8 How water and minerals absorbed by the roots of the plants reach the leaves?

Q9 Explain the process of photosynthesis in plants along with the diagram?

Q10 Name the pigment present in the leaves that captures sunlight?

Q11 Draw a well labeled diagram of a) section of a leaf b) stomata

Q12 Can plants with leaves other than green carry out photosynthesis. Justify your answer?

Q13 Explain the mode of nutrition in algae?

Q14 How can you test the presence of starch in the leaves?

Q15 Differentiate betweena)

Host and parasite

b) Saprophytes and parasite

c) Fungi and algae

Q16 Some plants show heterotrophic mode of nutrition. Justify your answer by giving an  example.

Q17 Identify the mode of nutrition in
a) Mushroom
b) Cuscuta
c) Leech
d) Tapeworm
e) bacteria
f) Yeast
f) Ticks

Q17 Explain the different types of heterotrophic nutrition?

Q18 With which group of plants ,Rhizobium is assosciated and what is its role?

Q19 What is a symbiotic mode of nutrition .Give its example.

Q20 Lichens show symbiotic mode of nutrition. Justify your statement.

Q21 What are the favourable conditions for the growth of fungus?

Q21 During rainy season your shoes get spoiled .Why?

Q22 Fungi can be useful as well as harmful.Comment.

Q23 How do saprophytes obtain their nourishment?

Q24 What are the three ways by which nutrients are replenished in the soil?

Q25 What are stomata? What is its role?

Q26 If a farmer is growing leguminous plant in his field ,he does not have to add nitrogen fertilizers to the soil .Why?

Q27 What are insectivorous plants? Give its example.

Q28 Human beings are autotroph as they cook their food using different ingredients. Is this true?

Justify your answer.

Q29 How does a pitcher plant gets its nutrition?

Q30 Describe the ways by which green plants procure all the raw materials required for photosynthesis.

Learn and write the following key words –
1 Autotrophs – Organisms that can make their food from simple inorganic substances.
2 Heterotrophs - Organisms that cannot make their food and depend on green plants for their food.
3 Saprophytes- Plants which derive their food from dead and decaying g organic matter.
4 Parasites- Organisms that derive their food from the body of host plant or animal.
5 Insectivorous plants- green plants which make their own food but depend on insects for nitrogenous food.
6 Symbionts- two plants which live together as part of the same plant and mutually help each other.
7 Symbiosis – the mode of nutrition in which two different organisms work together for their mutual benefit.
8 Photosynthesis - the process by which green plants make their food.
9 Herbivores- the animals which eat only grass, plants or plant products are called herbivores. ex-cow, goat etc.
10 Carnivores-The animals which eat meat or flesh of the other animals are called carnivores. ex –lion, frog etc.
11 Omnivores- the animals which eat both plants and meat are called omnivores. ex –crow, dog etc.

Read the following paragraph and answer the questions -
The process by which green plants make their food from carbon dioxide and water in the presence of sunlight and chlorophyll is called photosynthesis. The basic products formed during photosynthesis are glucose and oxygen.

Q1 The gas which is used in the process of photosynthesis.
Answers : Carbon dioxide

Q2 The gas which is produced in the process of photosynthesis.
Answers : Oxygen

Q3 Name the factors which are important for the process of photosynthesis.
Answers : Co₂ ,water, solar energy and chlorophyll in leaves

Q4 Describe the role of leaves in photosynthesis.
Answers : Photosynthesis occurs mostly in leaves .The inner structure of the leaf shows two important features- 1 Presence of chlorophyll containing cells.,2 Presence of stomata CO₂ enters a leaf through these pores

Q5 Name the factors which affect the process of photosynthesis.
Answers : Light intensity, Temperature and poor availability of CO₂ and water

Name the following :

1. A plant pigment that absorbs sunlight.

2. Small openings on leaves.

3. Part of a plant where photosynthesis generally occurs.

4. A plant that eats insects is called as this .

5. The process by which plants and some bacteria use the energy from sun to produce carbohydrates.

6. The cells which form stomata.

7. The raw materials required for photosynthesis.

8. The gas released during photosynthesis.

9. The raw materials required for photosynthesis?

10. Name the elements of which carbohydrates are made up of?

Fill in the blanks:

1. The entire process of taking in food and using it for growth and maintenance of the body by the living organisms is called------------

2. The relationship in which the both the types of plants mutually gain from each other is called --------

3. ------------is an association between a fungus and an algae.

4. During photosynthesis , plants obtain carbon di oxide from the atmosphere through-------------.

5. ------------plants grow in places with lot of rotting places.

Ans the following:-

1. What are nutrients ? Give examples.

2. What is nutrition? Name the major modes of nutrition.

3. Differentiate between autotrophs and heterotrophs.

4. What is photosynthesis? Write equation for photosynthesis.

5. Where are stomata located? Write two important functions performed by stomata.

6. How are the minerals and water reach the leaves from the roots?

7. How does chlorophyll help in the process of Photosynthesis?

8. How do we test the presence of starch in the leaves?

9. Draw and label a neat diagram of stomata.

10.What are algae? Are they autotrophs?

11. How do plants obtain nitrogen to synthesise proteins?

12. What mode of nutrition is found in cuscuta and why?

13. efine host and parasite?

14. What are insectivorous plants? How do they obtain food?

15. Name the white cottony growth that develops on the rotting bread.

16. What is saprotrophic mode of nutrition?

17. What is symbiosis? Illustrate.

18. Why do farmers add fertilizers to the soil?

19. What is Rhizobium? Name four leguminous crops

20. How are leguminous crops and Rhizobium related to each other?

Learn and write the following questions and answers-

Question 1: Why do organisms need to take food?
Answer: Organisms need to take food so that they can get raw material for growth and repair and can get energy for carrying out various activities.

Question 2: Distinguish between a parasite and a saprotroph.
Answer: A parasite lives on or inside the body of another organism; to get shelter and food. A parasite lives on a live host. On the other hand, a saprotroph feeds on dead and decaying remains of animals and plants.

Question 3: How would you test the presence of starch in leaves?
Answer: Steps to test the presence of starch in leaves:
● Boil the leaf in water for about 10 minutes.
● After that, boil the leaf in alcohol; over water bath.
● Wash the boiled leaf with cold water and spread on a flat surface.
● Pour a few drops of iodine on the leaf. If the iodine turns into dark blue colour, it shows the presence of starch in the leaf.

Question 4: Give a brief description of the process of synthesis of food in green plants.
Answer:  Photosynthesis is the process by which green plants make food. Green plants trap solar energy with the help of chlorophyll. Water and carbon dioxide are the raw materials, which are converted into carbohydrates; during the process. Oxygen is the byproduct of photosynthesis. This can be shown by the following equation: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Question 4: How do nutrients get replenished in the soil?
Answer:  There are two main means through which nutrients get replenished in the soil. One of them is the nitrogen fixation in soil. Nitrogen fixation replenishes nitrogenous nutrients in the soil. Another mean is decomposition of dead remains of plants and animals (or farm waste). Decomposition of dead remains replenishes various other nutrients in the soil.

Question 5: What is the meaning of word ‘Symbiosis’?
Answer:  It is a relationship between two organisms in which both the organisms benefit each other.

Question 6: What is Lichen?
Answer:  The lichen is a composite organism formed because of symbiosis of algae and fungi.

Question 7: What do you understand by saprotrophs?
Answer:  An organism which feed on dead and decaying material is called a saprotroph. In this mode of nutrition, digestive enzymes are secreted on the food. The digested food is then absorbed by the organism. In saprotrophs digestion takes place outside the body of the organism.

Question 8: What is an insectivorous plant?
Answer:  A plant which fulfills its nitrogenous needs by eating insects is called an insectivorous plant.

Question 9: Give an example of insectivores plant?
Answer:  Pitcher plant, Venus Fly trap, Bladderwort, Drosera, Rafflesia

Question 10: Why does a plant eat insects?
Answer:  Plants living in marshy areas do not get nitrogen from the soil. To fulfill their nitrogenous need, they need to eat insects.

Nutrition in Plants

Question 3- Match the Following: 

More question-

I) Fill in the blanks:

1. The components of food which are necessary for our body are called _______________

2. Green plants synthesise their own food themselves by the process of __________________.

3. ______________________ is the mode of taking food by an organism and its utilization by the body.

4. Complex chemical substances such as ______________ are the products of photosynthesis.

5. ___________________ gas is produced during photosynthesis.

6. Organisms that are dependent on others for their nutrition are called ______________________

7. _________________ are the tiny pores present on the surface of the leaves and are surrounded by guard cells.

8. ____________________is the ultimate source of energy for all living organisms.

9. Organisms which derive their nutrition from dead decaying matter are called _______________.

10. Some organisms live together and share shelter and nutrients, this is called _____________________.

11. Carbohydrates are made up of _________,__________ and __________.

II) Name the following :

1. A bacterium that can take atmospheric nitrogen and convert it into a soluble form.

2. An insectivorous plant.

3. The mode of nutrition in mushrooms.

4. The indicator used to test the presence of starch in leaves.

III) Write True or False :

1. Some fungi are used in medicines.[ ]

2. Most of the pulses are obtained from leguminous plants. [ ]

3. Cuscuta (Amarbel) is a host.[ ]

4. Lichens, an alga and a fungus show symbiotic relationship. [ ]

5. In desert plants, green stems carry out photosynthesis.[ ]

IV) Define the following

1. Autotrophs

2. Saprotrophs

3. Heterotrophs

4. Nutrition

V) Diagrams :

1. Cell

2. Photosynthesis in plants.