Last Updated on March 22, 2024 by XAM CONTENT
The NCERT Solutions have been updated for 2024-2025 sessions, with the new NCERT Books. All questions are solved with detailed explanation of each and every questions. In this article, we are providing NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants.
| NCERT Solutions | Class 7 Science |
|---|---|
| Session | 2024-2025 |
| Useful for | Class 7 Students |
| Chapter | Nutrition in Plants Chapter 1 |
| No. of Intext Questions | 10 |
| Exercise Questions | 13 |
| Format | Question-Answer Format |
[PDF] Nutrition in Plants Class 7 NCERT Solutions Science Chapter 1
NCERT Solutions
Intext Questions
Page-1
Q.1. Boojho wants to know how plants prepare their own food?
Ans. Plants can make their food themselves by a process known as photosynthesis.
Q.2. Paheli wants to know why our body cannot make food from carbon dioxide, water and minerals like plants do?
Ans. We do not have chlorophyll in our body.
Page-2
Q.3. Boojho wants to know how water and minerals absorbed by roots reach the leaves?
Ans. Water and minerals are transported to the leaves by the vessels which run like pipes throughout the roots, stems, and leaves of the plant. They constitute a continuous path or passage for the nutrients to reach the leaves.
Q.4. Paheli wants to know what is so special about the leaves that they can synthesise food but other parts of the plant cannot?
Ans. For the simple reason that leaves possess a green pigment known as chlorophyll.
Page-3
Q.5. Boojho has observed some plants with deep red, violet or brown leaves. He wants to know whether these leaves also carry out photosynthesis.
Ans. Yes, plants with red, violet and brown leaves can perform photosynthesis. The green color of chlorophyll in the leaves is masked by the presence of large amount of red, brown and violet pigments.
Page-5
Q.6. Paheli wants to know whether mosquitoes, bed bugs, lice and leeches that suck our blood are also parasites.
Ans. Yes, mosquitoes, bed bugs, lice and leeches are parasites because they suck our blood and get nutrition without providing any benefits to us.
Q.7. Boojho is confused. If the pitcher plant is green and carries out photosynthesis, then why does it feed on insects?
Ans. The pitcher plants grow in soil which lacks in nitrogen content. Pitcher plant gets all the nutrients by the process of photosynthesis except nitrogen. So, they feed on insects to obtain the nitrogen needed for their growth.
Page-6
Q.8. Boojho wants to know how these organisms acquire nutrients. They do not have mouths like animals do. They are not like green plants as they lack chlorophyll and cannot make food by photosynthesis.
Ans. These organisms obtain their food from dead organisms.
Q.9. Paheli is keen to know whether her beautiful shoes, which she wore on special occasions, were spoiled by fungi during the rainy season. She wants to know how fungi appear suddenly during the rainy season.
Ans. Fungal spores are generally present in the air. As they land on wet and warm things, they germinate and grow. During rainy reason, there is much moisture in air. So, fungi spoil more things in rainy season.
Page-7
Q.10. Boojho says once his grandfather told him that his wheat fields were spoiled by a fungus. He wants to know if fungi cause diseases also.
Ans. Yes. Fungi can be the root cause of many diseases in plants and animals such as rust of wheat in plants and skin diseases, intestinal problems in animals, etc. However, some fungi are also used in medicines.
Also read: Nutrition in Plants Assertion Reason for Class 7 Science
Exercise Questions
Q.1. Why do organisms take food?
Ans. Organisms need food to:
(i) Get energy to do work.
(ii) Build up body.
(iii) Repair damages in the body.
(iv) Maintain the functions of the body.
Q. 2. Distinguish between a parasite and a saprotroph.
Ans.
| Parasite | Saprotroph |
| (i) Parasites obtain nutrients from the living organisms. | They obtain nutrients from dead and decaying organisms. |
| (ii) Parasites mostly live on or in the host. | They live on dead and decaying stuff. |
Q. 3. How would you test the presence of starch in leaves?
Ans. When iodine comes in contact with starch, a dark blue colour develops. By dropping iodine solution on the leaves, we can check the presence of starch.
Q. 4. Give a brief description of the process of synthesis of food in green plants.
Ans. Photosynthesis is the process of making food (carbohydrate and water) using carbon dioxide, water and minerals in presence of sunlight. Leaves are the site for the photosynthesis. The things required for photosynthesis are water, carbon dioxide and minerals. Roots absorb water and minerals from soil and transport to the leaves. Tiny pores present on the surface of leaves are called stomata which absorb carbon dioxide from the air.
Leaves contain a green colour pigment known as chlorophyll which helps leaves to capture the light energy of the sunlight required for the process of photosynthesis.
The process of photosynthesis is represented by the equation:
Carbohydrate formed during photosynthesis is stored as starch in leaves.
Q. 5. Show with the help of a sketch that plants are the ultimate source of food.
Ans.
Q. 6. Fill in the blanks:
(a) Green plants are called _____ since they synthesise their own food.
(b) The food synthesised by plants is stored as____________
(c) In photosynthesis, solar energy is absorbed by the pigment called .
(d) During photosynthesis plants take in _______and release _______gas.
Ans.
(a) autotrophs (b) starch (c) chlorophyll (d) carbon dioxide, oxygen
Q. 7. Name the following:
(i) A parasitic plant with yellow, slender and branched stem.
(ii) A plant that is partially autotrophic.
(iii) The pores through which leaves exchange gases.
Ans. (i) Cuscuta (Amarbel)
(ii) Pitcher plant
(iii) Stomata
Q. 8. Tick the correct answer:
(a) Cuscuta is an example of:
(i) autotroph
(ii) parasite
(iii) saprotroph
(iv) host
(b) The plant which traps and feeds on insects is:
(i) Cuscuta
(ii) china rose
(iii) pitcher plant
(iv) rose
Ans.
(a) (ii) Parasite
(b) (iii) pitcher plant
Q. 9. Match the items given in Column I with those in Column II:
| Column I | Column II | ||
| (a) | Chlorophyll | i | Rhizobium |
| (b) | Nitrogen | ii | Heterotrophs |
| (c) | Cuscuta | iii | Pitcher plant |
| (d) | Animals | iv | Leaf |
| (e) | Insects | v | Parasite |
Ans.
| Column I | Column II | ||
| (a) | Chlorophyll | iv | Leaf |
| (b) | Nitrogen | i | Rhizobium |
| (c) | Cuscuta | v | Parasite |
| (d) | Animals | ii | Heterotrophs |
| (e) | Insects | iii | Pitcher plant |
Q.10. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) Carbon dioxide is released during photosynthesis.
(ii) Plants which synthesise their food are called saprotrophs.
(iii) The product of photosynthesis is not a protein.
(iv) Solar energy is converted into chemical energy during photosynthesis.
Ans. (i) False
(ii) False
(iii) True
(iv) True
Q.11. Choose the correct option from the following:
Which part of the plant takes in carbon dioxide from the air for photosynthesis?
(i) Root hair
(ii) Stomata
(iii) Leaf veins
(iv) Petals
Ans. (ii) Stomata
Q. 12. Choose the correct option from the following: Plants take carbon dioxide from the atmosphere mainly through their:
(i) roots
(ii) stem
(iii) flowers
(iv) leaves
Ans. (iv) Leaves
Q. 13. Why do farmers grow many fruits and vegetable crops inside large green houses? What are the advantages to the farmers?
Ans. A greenhouse is built of any material through which sunlight can pass, such as glass or plastic. The air continues to heat up because it gets confined within the green house. To provide warmer temperatures for growing fruit and vegetable plants, farmers grow them inside large green houses. Farmers get many advantages like the crops grow well. It also protects them from high blowing wind and rodents.
Also check
- NCERT Solutions for Class 7 Science Chapter 3 Heat
- NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals
- NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants
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