NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants
With the help of NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants you can solve the difficulties that lie ahead with ease. These NCERT Solutions are prepared as per the accordance of latest CBSE guidelines so you can score maximum marks. Class 7 NCERT Solutions is an effective method for learning since you can be able to learn a lot within a short time. In the examinations, you will can come up with better answers and lay out the main point effectively.
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NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants
Your marks play an important role in shaping future thus these NCERT Solutions for Class 7 Science Chapter 1 will become your comprehensive guide in easy learning. It can be used to enrich knowledge and make lessons for learners more exciting. These NCERT Solutions are curated by the experts in a comprehensive which can be helpful in clearing your doubts instantly.
| Study Material for Class 7 Science Chapter 1 Nutrition in Plants |
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Page No: 9
Exercises
1. Why do organisms need to take food?
Answer
Organisms need to take food to get energy and perform life process. The life process include nutrition, respiration, growth, excretion, reproduction and response to stimuli which can only be done by intake of food.
2. Distinguish between a parasite and a saprotroph.
Answer
| Parasite | Saprotroph |
| The organism that grows on the body of another organism and derives nutrients from it is known as a parasite. | The organism that obtains nutrients from the dead or decaying organic matter is called saprotroph. |
| They take the readymade food from the host. | They take the digested and decayed food. |
| They directly feed on living organisms for their nutrition. | They feed on dead and decaying organism. |
| Examples- Cuscuta and orchids. | Examples- Fungi and some bacteria. |
3. How would you test the presence of starch in leaves?
Answer
Steps to test the presence of starch in leaves :
Step 1: A fresh leaf is taken.
Step 2: The leaf is boiled in water for few minutes to kill the cells in the leaf.
Step 3: Now, dip this leaf in iodine solution.
Step 4: The color of the leaf will changes into blue black color when iodine is added to it which shows the presence of starch in it.
4. Give a brief description of the process of synthesis of food in green plants.
Answer
Photosynthesis is the process synthesis of food in the plants with the help of chlorophyll and carbon dioxide in the presence of sunlight.
Water and minerals present in the soil are absorbed by the roots and transported to the leaves by the vessels.
Carbon dioxide from air is taken through stomata present in leaves.
Leaves are the food factories of the plants which capture the energy of the sunlight with the help of chlorophyll. This energy is used to synthesize food from carbon dioxide and water.
5. Show with the help of a sketch that the plants are the ultimate source of food.
Answer
The food chain shows that the plant is the ultimate producer. Only plant can produce food and rest of other organisms are directly or indirectly dependent on it.
6. Fill in the blanks:
(a) Green plants are called _________________ since they synthesise their own food.
(b) The food synthesised by the plants is stored as _________________.
(c) In photosynthesis solar energy is captured by the pigment called ___________.
(d) During photosynthesis plants take in ______________________ and release __________________.
Answer
(a) Green plants are called autotrophs since they synthesise their own food.
(b) The food synthesised by the plants is stored as starch.
(c) In photosynthesis solar energy is captured by the pigment called chlorophyll .
(d) During photosynthesis plants take in carbon dioxide and release oxygen.
7. Name the following:
(i) A parasitic plant with yellow, slender and tubular stem.
(ii) A plant that has both autotrophic and heterotrophic mode of nutrition.
(iii) The pores through which leaves exchange gases.
Answer
(i) Cuscuta (Amarbel)
(ii) Pitcher plant
(iii) Stomata
8. Tick the correct answer:
(a) Amarbel is an example of:
(i) autotroph
(ii) parasite
(iii) saprotroph
(iv) host
► (ii) parasite
(b) The plant which traps and feeds on insects is:
(i) Cuscuta
(ii) china rose
(iii) pitcher plant
(iv) rose
► (iii) pitcher plant
9. Match the items given in Column I with those in Column II:
| Column I | Column II |
| Chlorophyll | Bacteria |
| Nitrogen | Heterotrophs |
| Amarbel | Pitcher Plant |
| Animals | Leaf |
| Insects | Parasite |
Answer
| Column I | Column II |
| Chlorophyll | Leaf |
| Nitrogen | Bacteria |
| Amarbel | Parasite |
| Animals | Heterotrophs |
| Insects | Pitcher Plant |
Page No: 10
10. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) Carbon dioxide is released during photosynthesis. (T/F)
► False
(ii) Plants which synthesise their food themselves are called saprotrophs. (T/F)
► False
(iii) The product of photosynthesis is not a protein. (T/F)
► True
(iv) Solar energy is converted into chemical energy during photosynthesis. (T/F)
► True
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) Sepals
► (ii) Stomata
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
► (iv) leaves
Go Back To NCERT Solutions for Class 7 Science
Chapter 1 Nutrition in Plants Class 7 Science NCERT Solutions
You can pinpoint your weaknesses with the help of these NCERT Solutions for Class 7 Science Chapter 1 and prepare accordingly to change it in a positive way. NCERT Solutions for Science prepared by our experts try to provide all round clarity of questions. Through these NCERT Solutions, students should not waste time and adopt a strategy that helps them operate and learn at maximum efficiency.
Class 7 Science Chapter 1 Nutrition in Plants NCERT Questions and Answers - Topics
• Mode Of Nutrition In Plants
• Photosynthesis — Food Making Process In Plants
→ Synthesis of plant food other than carbohydrates
• Other Modes Of Nutrition In Plants
• Saprotrophs
• How Nutrients Are Replenished In The Soil
Chapter 1 Nutrition in Plants NCERT Solutions for Class 7 Science - Notes
• Carbohydrates, proteins, fats, vitamins and minerals are components of food are called nutrients and are necessary for our body.
• Nutrition is the mode of taking food by an organism and its utilisation by the body. The mode of
nutrition in which organisms make food themselves from simple substances is called autotrophic (auto = self; trophos = nourishment) nutrition. Therefore, plants are called autotrophs.
→ Animals and most other organisms take in food prepared by plants. They are called heterotrophs (heteros = other).
• The synthesis of food occurs in the presence of sunlight, it is called photosynthesis (Photo: light; synthesis : to combine). So we find that chlorophyll, sunlight, carbon dioxide and water are necessary to carry out the process of photosynthesis.
→ The lower epidermis has openings called the stomata. The stomata take in carbon dioxide from the air.
→ Chlorophyll captures energy from sunlight and uses it to prepare food from carbon dioxide and water.
→ Thus, sun is the ultimate source of energy for all living organisms.
• The slimy, green patches in ponds or stagnant water bodies generally formed by the growth of organisms called algae. They contain chlorophyll which gives them the green colour. Algae can also prepare their own food by photosynthesis.
• Heterotrophic plants do not have chlorophyll, and cannot produce food by photosynthesis.
• The cuscuta plant derives valuable nutrients from the host plant, so it is called parasitic.
• Fungi obtain their nutrition from dead and decaying organic matter. They secrete digestive juices onto dead and decaying matter and then absorb the nutrients from it.
• Plants that use saprotrophic nutrition are called saprotrophs. The mode of nutrition in which organisms take in nutrients in solution form from dead and decaying matter is called saprotrophic nutrition.
• Fungi reproduce using spores that germinate and grow into a new fungus.
• Rhizobium bacteria forms a symbiotic relationship with plants such as gram, peas, moong beans and other legumes.
Chapter 1 Nutrition in Plants Class 8 Science Questions and Answers - MCQ Questions with answers
1. Which part of the leaf controls the rate of loss of water to the air?
a) Midrib
b) Stomata
c) Vascular bundles
d) Veins
► b) Stomata
2. Which of the following statements is true about croton plants?
a) Croton plants do not contain chlorophyll.
b) Croton plants are dark red in colour. Hence they depend on other plants for food.
c) Croton plants have chlorophyll but it is hidden by dark red colour pigments.
d) Croton plants are parasites
► c) Croton plants have chlorophyll but it is hidden by dark red colour pigments.
3. Which one is saprophytic organism?
a) Algae
b) Mushroom
c) Cuscuta
d) Mango
► b) Mushroom
4. Which bacteria convert atmospheric nitrogen into soluble form?
a) Rhizobium
b) Spirillum
c) Lactobacillus
d) Methanogen
► a) Rhizobium
5. Which of the following is insectivorous?
a) Mushroom
b) Cuscuta
c) Mucor
d) Nepenthes
► d) Nepenthes
6. The small pores present on the leaves are called:
a) Lenticels
b) Guard cell
c) Stomata
d) Epidermis
► c) Stomata
7. The ultimate source of energy for all living organisms is:
a) Planets
b) Moon
c) Sun
d) Coal
► c) Sun
8. Components of food are called
a) Nutrients
b) Food
c) Substrate
d) Enzyme
► a) Nutrients
9. What role does the insect play in the insectivorous plant?
a) Fertilization process.
b) Provides nutrients to the plant.
c) Dispersal of seeds.
d) Provides carbon dioxide to the plant.
► b) Provides nutrients to the plant.
10. Pitcher plant traps insects because it:
a) grows in soils which lack in nitrogen.
b) is a heterotroph.
c) does not have chlorophyll.
d) has a digestive system like human beings.
► a) grows in soils which lack in nitrogen.
NCERT Textbook will provide you with a lot of interesting topics thus these NCERT Solutions for Class 7 will be useful in understanding in depth concepts well. It will improve your awareness skills sharply and you can easily memorize more things precisely.