NCERT Exemplar Solutions Class 7 Science Chapter 1 Nutrition in Plants

NCERT Exemplar for Class 7 Science plays a crucial role in understanding the topic clearly, thereby plays a pivotal role from the point of your future studies. Studying this exemplar will help you gain complete knowledge on the topics and aids you in making your basics strong.

This exemplar solutions for class 7 science has answers to 8 MCQ’S, 2 Very Short answer questions, 6 Short answer questions and 5 long answer questions from chapter 1.

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NCERT Exemplar solution class 7 science Chapter 1 1
NCERT Exemplar solution class 7 science Chapter 1 2
NCERT Exemplar solution class 7 science Chapter 1 3
NCERT Exemplar solution class 7 science Chapter 1 4
NCERT Exemplar solution class 7 science Chapter 1 5
NCERT Exemplar solution class 7 science Chapter 1 6
NCERT Exemplar solution class 7 science Chapter 1 7
NCERT Exemplar solution class 7 science Chapter 1 8

NCERT Exemplar for Class 7 Chapter 1 Nutrition in Plants importance

NCERT Exemplar solutions for class 7 science chapter 1 nutrition in plants deal with a variety of questions on the mode of nutrition in plants, how plants fulfil their nutrition requirement, the biochemical process of photosynthesis, their equation, how plants prepare their own food by photosynthesis, diagrammatic representation and pathways. This solution also covers questions on the mode of nutrition in saprophytes which proves to be an extension of learning nutrition in different organisms.

Sub Topics of Class 7 Science Chapter 1 nutrition in plants

1.1 – Mode of Nutrition in Plant

1.2 – Photosynthesis – Food Making Process in Plants

1.3 – Other Modes of Nutrition in Plants

1.4 – Saprotrophs

1.5 – How Nutrients Are Replenished In the Soil

Access Answers of NCERT exemplar for Class 7 Science Chapter 1- Nutrition in Plants

Multiple Choice Questions

1. Organisms which prepare food for themselves using simple naturally available raw materials are referred to as

(a) heterotrophs

(b) autotrophs

(c) parasites

(d) saprophytes

Soln:

Answer is (b) autotrophs

Explanation:

Organisms which prepare food for themselves using simple naturally available raw materials are referred to as autotrophs.

Organisms which are dependent on plants for their food are known as heterotrophs.

Parasites are those organisms which live and dependent on the host for food. Hey obtain food at the cost of their host.

Saprophytes are the organisms which eat dead and decaying matter as food.

2. In the absence of which of the following will photosynthesis not occur in leaves?

(a) Guard cells

(b) Chlorophyll

(c) Vacuole

(d) Space between cells

Soln:

Answer is (b) Chlorophyll

Explanation:

The leaves have a green pigment called chlorophyll. It helps leaves to capture the energy of the sunlight. This energy is used to synthesise (prepare) food from carbon dioxide and water.

3. 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:

(a) (i) and (iv)

(b) (ii) only

(c) (ii) and (iii)

(d) (i) and (ii)

Soln:

Answer is (a) (i) and (iv)

Explanation:

Statement ii) is wrong because animals are heterotrophs.

Statement iii) is wrong because CO2 is necessary for photosynthesis.

4.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.

Soln:

Answer is (b) grows in soils which lack in nitrogen.

Explanation:

Pitcher plant grows in soil which is deficient in Nitrogen. Pitcher plant carrying out photosynthesis to produce carbohydrates. But for nitrogen source it traps and digests the insects.

5. The term that is used for the mode of nutrition in yeast, mushroom and bread-mould is

(a) autotrophic

(b) insectivorous

(c) saprophytic

(d) parasitic

Soln:

Answer is (c) saprophytic

Explanation:

These all are fungi, They absorb the nutrients from the dead and decaying matter. They secretes digestive juices which help them to digest organic material. This type of absorbing nutrition is called saprophytic mode of nutrition.

6. 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

Soln:

Answer is (a) Stomata

Explanation:

Lamina is the green expanded part of the leaf with veins and veinlets. Midrib is middle prominent vein. Veins provide rigidity to leaf and act as channels for transport of water, minerals and food materials. Stomata are the minute pores usually located on the underside of the leaves and take part in exchange of gases (02 and CO2) during photosynthesis and respiration. They are surrounded by guard cells.

7. Two organisms are good friends and live together. One provides 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

Soln:

Answer is (d) symbiosis

Explanation:

Saprophyte are those which feed on dead and decaying matter. Parasites are the organisms which feed on other organisms. Autrophs are those which prepare their own food.

8.Which of the following raw material is available in the air for photosynthesis?

(a) Oxygen

(b) Carbon dioxide

(c) Nitrogen

(d) Hydrogen

Soln:

Answer is (b) Carbon dioxide

Explanation:

Plants prepare their own food by using Carbon dioxide and water to produce carbohydartes and oxygen. Carbon-di-oxide present in air is utilized by plants as carbon source.

Very Short Answer Questions

9. Potato and ginger are both underground parts that store food. Where is the food prepared in these plants?

Soln:

In these plants shoot system and leaves stays above ground. They prepare food by photosynthesis and stores energy in the underground part of plant.

10. Photosynthesis requires chlorophyll, and a few other raw materials. Add the missing raw materials to the list given below: Water, minerals, _____________, ______________.

(a) (b)

Soln:

Sunlight/light energy, (b) carbondioxide.

Short Answer Questions

11. 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?

Soln:

Plants have stored food in their stems and roots. Because of this plants live for few days without leaves.

12. Unscramble the following to form terms related to modes of nutrition.

(i) RASPAEIT

(ii) ROPEHYTSAP

(iii) TOROPHAUT

(iv) SIBIOMSYS

Soln:

  1. PARASITE
  2. SAPROPHYTE
  3. AUTOTROPH
  4. SYMBIOSIS

13. Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, bengal gram, black gram, etc. do not apply nitrogenous fertilizers during cultivation. Why?

Soln:

Roots of pulses has symbiotic relationship with a bacteria called Rhizobium. This bacteria fixes atmospheric nitrogen which will be utilized by leguminous plants. Hence farmers don’t apply nitrogen fertilizers while cultivating cereals.

14. Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason.

Soln:

Carbohydrates present in dough will provide nutrients for the growth of yeast and other fungi. These breaks down glucose to emit foul smell and spoils dough.

15. 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 : _______________

Soln:

(a) Available in the plant : Chlorophyll

(b) Available in the soil :Water, Minerals

(c) Available in the air : Carbon-di-oxide

(d) Available during day : Sunlight

16. Observe the diagram given as Figure 1.1 and label the following terms given in the box

NCERT Exemplar Solutions Class 7 Science Chapter 1-sol-1

Soln:

NCERT Exemplar Solutions Class 7 Science Chapter 1-sol-2

Long Answer Questions

17. Match the organisms given in Column I with their mode of nutrition given in Column II.

Column I

Column II

a) Mango tree

i) Insectivorous plant

b) Mushroom

ii) Heterotroph

c) Pitcher Plant

iii) Autotroph

d) Cuscuta

iv) Saprophyte

e) lephant

v) Parasitic

Soln:

Column I

Column II

a) Mango tree

iii) Autotroph

b) Mushroom

iv) Saprophyte

c) Pitcher Plant

i) Insectivorous plant

d) Cuscuta

v) Parasitic

e) Elephant

ii)Heterotroph

18. 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?

Soln:

Wild animals like tiger, wolf, lion and leopard do not eat plants. But they feed on herbivore animals which eat plants. If plants does not exist, if plants will not exist due to lack of food. Further wild animals cannot live as they will not be having food. Hence it is said that directly or indirectly all the living organisms depend on plants for food.

19. Fill in the blanks of the paragraph given below with the words provided in the box.

NCERT Exemplar Solutions Class 7 Science Chapter 1-sol-3

Leaves have a green pigment called (a) which captures (b) from sunlight. This (c) is used in the process of (d) and along with other raw materials like (e) and (f) synthesize (g) .

Soln:

Leaves have a green pigment called Chlorophyll which captures energy from sunlight. This energy is used in the process of photosynthesis and along with other raw materials like water and carbon-di-oxide synthesize food .

20. Spot as many organisms as possible in the puzzle given as Figure 1.2 by encircling them as shown. Write the names on a sheet of paper and categorise them into autotrophs and heterotrophs. Classify the heterotrophs into herbivores, carnivores, omnivores and saprophytes.

Soln:

Number of organisms : 22

(Some examples are given. You may find the rest of the organisms.)

NCERT Exemplar Solutions Class 7 Science Chapter 1-sol-4

Autotrophs – Rose, Mango, Bhindi, Carrot, Banyan, Tulsi, Ginger, Yam

Heterotrophs – Elephant, Ant, Yeast, Tiger, Mushroom, Fox, Mice, Owl, Cow, Crow, Rabbit, Bee, Fish

Herbivores – Elephant, Cow, Rabbit, Bee

Carnivores – Fox,Tiger

Omnivores – Ant, Mice, Owl, Crow, Fish

Saprophytes – Mushroom, Yeast

21. Can you give me a name? Solve each of the following riddles by writing the name of the organism and its mode of nutrition. One riddle is solved to help you.

(a) I am tall but I cannot move. I am green and can prepare my own food. tree, autotroph

(b) I live in water; people keep me in an aquarium and feed me. ,

(c) I am small and I can fly. I disturb your sleep, bite you and suck your blood which is my food. ,

(d) I am white and soft. I grow well in the rainy season. Children pluck me from the ground and admire me. I absorb nutrients from decomposed dead parts of plants and animals in the soil. , .

Soln:

(b) fish, heterotroph

(c) mosquito, parasite

(d) mushroom, saprophyte

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Frequently Asked Questions NCERT Exemplar for Class 7 Science Chapter 1 Nutrition in Plants

Potato and ginger are both underground parts that store food. Where is the food prepared in these plants?

In these plants shoot system and leaves stays above ground. They prepare food by photosynthesis and stores energy in the underground part of plant.

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?

Plants have stored food in their stems and roots. Because of this plants live for few days without leaves.

Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, bengal gram, black gram, etc. do not apply nitrogenous fertilizers during cultivation. Why?

Roots of pulses has symbiotic relationship with a bacteria called Rhizobium. This bacteria fixes atmospheric nitrogen which will be utilized by leguminous plants. Hence farmers don’t apply nitrogen fertilizers while cultivating cereals.

Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason?

Carbohydrates present in dough will provide nutrients for the growth of yeast and other fungi. These breaks down glucose to emit foul smell and spoils dough.

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?

Wild animals like tiger, wolf, lion and leopard do not eat plants. But they feed on herbivore animals which eat plants. If plants does not exist, if plants will not exist due to lack of food. Further wild animals cannot live as they will not be having food. Hence it is said that directly or indirectly all the living organisms depend on plants for food.