NCERT Solution - Nutrition in Plants Class 7 Notes | EduRev

Science Class 7

Class 7 : NCERT Solution - Nutrition in Plants Class 7 Notes | EduRev

The document NCERT Solution - Nutrition in Plants Class 7 Notes | EduRev is a part of the Class 7 Course Science Class 7.
All you need of Class 7 at this link: Class 7

Q.1. Why do organisms need to take food?
Ans. Food is required by all living organisms mainly for four reasons or purposes:

  • Food helps a living organism to grow. If enough food is not given or if, the food given is not of the right kind, the organism will not have proper growth.
  • Another important function of food is to provide energy which is required for any living organism for movements and other activities.NCERT Solution - Nutrition in Plants Class 7 Notes | EduRevFood
  • Food is also needed by living organisms for the replacement and repairing of their damaged parts.
  • Food provides us with the power to fight against infections and diseases.

Q.2. Distinguish between a parasite and a saprotroph.
Ans.
NCERT Solution - Nutrition in Plants Class 7 Notes | EduRev

Q.3. How would you test the presence of starch in leaves?
Ans. The presence of starch on leaves can be tested by the Iodine Test. Iodine turns starch solution blue.

NCERT Solution - Nutrition in Plants Class 7 Notes | EduRevStarch Test


Q.4. Give a brief description of the process of synthesis of food in green plants.
Ans. NCERT Solution - Nutrition in Plants Class 7 Notes | EduRevPhotosynthesis

  • Leaves have a green pigment called chlorophyll. In presence of sunlight, they use carbon dioxide and water to synthesize carbohydrate. 
  • During this process, oxygen is released. The carbohydrates ultimately get converted into starch
  • Carbon dioxide from the air is taken through stomata
  • Water and minerals are absorbed by roots and transported to leaves.

Q.5. Show with the help of a sketch that the plants are the ultimate source of food.
Ans. The food chain below shows that the plant is the ultimate producer.

NCERT Solution - Nutrition in Plants Class 7 Notes | EduRev

Food Chain


Q.6. Fill in the blanks:
(a) Green plants are called __________ since they synthesize their own food.
(b) The foods synthesized by the plants are stored as __________.
(c) During photosynthesis solar energy is captured by the pigment called _________.
(d) During photosynthesis plants take in __________ and release _________.   
Ans.
(a) autotrophs
(b) starch 
(c) chlorophyll 
(d) carbon dioxide, oxygen

Q.7. Name the following:
(i) A parasitic plant with a yellow, slender, tubular stem.
(ii) A plant that has both autotrophic and heterotrophic mode of nutrition.
(iii) The pores through which the leaves exchange gases.
Ans. 
(i) Cuscuta NCERT Solution - Nutrition in Plants Class 7 Notes | EduRevCuscuta(ii) Insectivorous plants (Pitcher Plant)
(iii) Stomata

Try yourself:Amarbel is an example of:

NCERT Solution - Nutrition in Plants Class 7 Notes | EduRev

View Solution

Try yourself:The plant which traps and feeds on insects is:
View Solution


Q.9. Match the items in column I with those in column II:

NCERT Solution - Nutrition in Plants Class 7 Notes | EduRevAns.
NCERT Solution - Nutrition in Plants Class 7 Notes | EduRev

  • Leaves have a green pigment called chlorophyll. Chlorophyll is essential in photosynthesis, allowing plants to absorb energy from light.
  • Plants cannot themselves obtain their nitrogen from the air but rely mainly on the supply of combined nitrogen in the form of ammonia, or nitrates, resulting from nitrogen fixation by free-living bacteria in the soil or bacteria living symbiotically in nodules on the roots of legumes.
  • Amarbel is an example of a parasite. Parasites are an incredibly varied group of organisms that live within host cells. They receive all sorts of benefits like food and shelter from the host plant.
  • The animals cannot prepare their own food. Therefore, they have to rely on other plants or animals for nutrition. This is known as heterotrophic nutrition.
  • The plant which traps and feeds on insects is the 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 synthesize their food themselves are called saprotroph.
(iii) The product of photosynthesis is not a protein.
(iv) Solar energy is converted into chemical energy during photosynthesis.
Ans. 
(i) False  
Oxygen is released during photosynthesis.
(ii) False 
Plants which synthesize their food themselves are called autotrophs.
(iii) True 
(iv) True

Try yourself:Choose the correct option in the following
Which part of the plant gets carbon dioxide from the air for photosynthesis?
View Solution

Try yourself:Choose the correct option in the following
Plants take carbon dioxide from the atmosphere mainly through their ______.
View Solution


Q.13. Why do farmers grow many fruits and vegetable crops inside large greenhouses? What are the advantages to the farmers?
Ans. 
Fruits and vegetable crops are grown in large greenhouses because it protects crops from external climatic conditions and to provide suitable temperature for the growth of crops.
Advantages to the farmers by growing fruits and vegetable crops inside large greenhouses are:

  • It provides optimum sunlight, temperature and water to the crop.
  • It protects crops from adverse climatic conditions.
  • It also protects crops from pests, rodents and different animals. Thus, preventing crops from several diseases.
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