NCERT Exemplar Solutions Class 7 Science Chapter 1 Nutrition in Plants
NCERT Exemplar Solutions for Class 7 Science Chapter 1 Nutrition in Plants play a crucial role in understanding the topic clearly, thereby playing a pivotal role from the perspective of your future studies. Studying this exemplar will help you gain complete knowledge on the topics, and thus, it will aid you in making your basics strong.
These Exemplar Solutions for Class 7 Science have answers to 8 MCQS, 2 very short answer questions, 6 short answer questions and 5 long answer questions from Chapter 1.
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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 to NCERT Exemplar Solutions 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:
The 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 are dependent on the host for food. They obtain food at the cost of their host.
Saprophytes are 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:
The 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 nitrogen.
(c) does not have chlorophyll.
(d) has a digestive system like human beings.
Soln:
The answer is (b) grows in soils which lack nitrogen.
Explanation:
Pitcher plant grows in the soil, which is deficient in Nitrogen. Pitcher plants carry 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:
The answer is (c) saprophytic
Explanation:
These are all fungi. They absorb the nutrients from the dead and decaying matter. They secrete digestive juices, which help them to digest the organic material. This type of absorbing nutrition is called the 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:
The answer is (a) Stomata
Explanation:
Lamina is the green expanded part of the leaf with veins and veinlets. The midrib is the middle prominent vein. Veins provide rigidity to leaves and act as channels for the transport of water, minerals and food materials. Stomata are the minute pores usually located on the underside of the leaves and take part in the 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:
The answer is (d) symbiosis
Explanation:
Saprophyte is those which feed on dead and decaying matter. Parasites are organisms which feed on other organisms. Autotrophs are organisms 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:
The answer is (b) Carbon dioxide
Explanation:
Plants prepare their own food by using Carbon dioxide and water to produce carbohydrates and oxygen. Carbon-di-oxide present in the air is utilized by plants as a 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 the plants, the shoot system and leaves stay above ground. They prepare food by photosynthesis and store energy in the underground part of the 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) carbon dioxide.
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 a 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:
- PARASITE
- SAPROPHYTE
- AUTOTROPH
- 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 have a 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 is left in the open, and after a few days, it starts to emit a foul smell and becomes unfit for use. Give reason.
Soln:
Carbohydrates present in the dough will provide nutrients for the growth of yeast and other fungi. These break down glucose to emit a foul smell and spoil 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 in Figure 1.1 and label the following terms given in the box.
Soln:
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) Elephant | 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 do not exist, these animals cannot exist due to the lack of food. Further, wild animals cannot live as they will not get food. Hence, it is said that, directly or indirectly, all living organisms depend on plants for food.
19. Fill in the blanks of the paragraph given below with the words provided in the box.
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 synthesises food.
20. Spot as many organisms as possible in the puzzle given in 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.)
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, the shoot system and leaves stay above ground. They prepare food by photosynthesis and store energy in the underground part of the 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 a 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 fertilisers during cultivation. Why?
Roots of pulses have a symbiotic relationship with a bacteria called Rhizobium. This bacteria fixes atmospheric nitrogen, which will be utilised by leguminous plants. Hence, farmers don’t apply nitrogen fertilisers while cultivating cereals.
Wheat dough is left in the open, and after a few days, it starts to emit a foul smell and becomes unfit for use. Give a reason.
Carbohydrates present in the dough will provide nutrients for the growth of yeast and other fungi. These break down glucose to emit a foul smell and spoil 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 do not exist, these animals will not exist due to the lack of food. Further, wild animals cannot live as they will not get food. Hence, it is said that, directly or indirectly, all living organisms depend on plants for food.
Please tell me how the plant synthesis their own food?
Learn how plants synthesis their own food from the link given below.
https://byjus.com/questions/explain-the-process-of-synthesis-of-food-in-green-plants/
Very nice