Science Class 7- Chapter 1- Nutrition in Plants- NCERT Exercise Solution (Question-Answer )

Science Class 7 – Chapter 1 –Nutrition in Plants- NCERT Exercise Solution (Question-Answer) is provided below. Total 13 Questions are in this NCERT Exercise, all are solved here.

Q1. Why do organism take food?

Answer- The organisms require energy for their life process. Food plays an important role for purposes such as-

  • Survive
  • Growth
  • Food gives us resistance to fight against disease and protect us from infections
  • Maintain bodily function
  • We need food for replacement and repairing damaged parts of body.
  • In plants , they prepare their own food and acquire nutrients from abiotic components like :-  soil , air , water and sunlight
  • Animals also take food to acquire nutrients and energy.

Q2. Distinguish between a parasite and saprotrophs .

Answer-

                  Saprotrophs               Parasites
They acquire nutrients from dead and decaying matter .They acquire nutrients from living organism.
They live on dead and decaying stuff.They mostly live on or in the host
They do not feed on a living     organismThe organism on which it feed is called host
  Eg. fungi Eg. roundworm

Q3. How would you test the presence of starch in leaves?

Answer- The presence of starch in leaves can be tested by the iodine test. We have to take two potted plants of the same kind. We will keep one pot in a darkroom and other pot in sunlight for 72 hours. After 3-4 days, we will perform the iodine test on the leaves of the plant. Put the iodine solution on the leaf. We will observe some blue-black colour on leaves of the plant which kept in sunlight that indicates the presence of starch. But, we don’t observe blue-black colour on leaves of the plant which kept in the darkroom that indicates the absence of the starch.

Q4. Give a brief description of the presence of the synthesis of food in green plants.

Answer- In the green plant, the synthesis of food occurs by a process called Photosynthesis. Plants use a simple chemical substance like carbon dioxide, water and minerals for the synthesis of food.

During photosynthesis, chlorophyll-containing cells of leaves, in the presence of sunlight, use carbon dioxide and water to synthesis carbohydrates.

This process can be represented by an equation-

Carbon dioxide + water  ➜carbohydrates + oxygen

in presence of sunlight and chlorophyll.

During this process, oxygen is liberated and the formed carbohydrates are stored in the form of starch.

Q5. Show with the help of sketch that plants are the ultimate source of food.

Answer-

  Producer (plant) ➜ primary consumer ( herbivores)➜ secondary consumer (carnivores) ➜ tertiary consumer ➜tertiary consumer➜decomposers

Attach diagram of food chain

Q6. Fill in the blanks:-

(a) Green plants are called ___________ since they synthesis their own food.

Answer-autotrophs

(b) The food synthesised by plants is stored as __________.

Answer- starch

(c) In photosynthesis, solar energy is absorbed by the pigment called ________________.

Answer- chlorophyll

(d) During photosynthesis, plants take in ________________ and release __________ gas.

Answer- carbon dioxide, oxygen

Q7. Name the following:

(i) A parasitic plant with yellow , slender and branched stem.

Answer- Cuscuta

(ii) A plant that is partially autotrophic.

Answer- Insectivores plant

(iii) The pores through which leaves exchange gases.

Answer-Stomata

Q8. Tick the correct answer –

(a) Cuscuta is an example of:

  (i) autotroph

  (ii) parasite

  (iii) saprotroph

  (iv) host

Answer– (ii) parasite

(b) The plant which traps and feeds on insect is:

(i) cuscuta

(ii) china rose

(iii) pitcher plant

(iv) rose

Answer– (iii) pitcher plant

Q9. Match the items given in column 1 with those in column 2-

Column 1              Column 2
Chlorophyll Rhizobium
Nitrogen   Heterotrophs
Cuscuta      Pitcher plant
Animals  Leaf
Insects    Parasite

Answer-       

Column 1              Column 2
Chlorophyll  Leaf
Nitrogen    Rhizobium
Cuscuta       Parasite
Animals   Heterotrophs
Insects     Pitcher plant

Q10. Mark ‘T’ if the statement is true and ‘F’ if it is false:

(i) Carbon dioxide is released during photosynthesis. (T/F)

Answer- (F)

(ii) Plants which synthesise their food are called saprotrophs .(T/F)

Answer- (F)

(iii) The products of photosynthesis is not a protein (T/F)

Answer- (T)

(iv) Solar energy is converted into chemical energy during photosynthesis. (T/F)

Answer- (T)

Q11. 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

Answer– (ii) stomata

Q12. Choose the correct option from the following:

Plants takes carbon dioxide from the atmosphere mainly through their:

(i) Roots

(ii) Stems

(iii) Flowers

(iv) Leaves

Answer- (iv) leaves

Q.13 Why do farmer grow many fruits and vegetable crops inside large greenhouses? What are the advantages to the farmer ?

 Answer- Farmer grow fruits and vegetable crops in large greenhouses to provide suitable temperature for growth of crops and protect crops from the external climatic condition.

There are some advantages to the farmer while growing fruits and vegetable crop inside greenhouses are-

  • It protects the crop from wind and rodents.
  • It protects the crop from diseases.
  •  It adverse climatic condition

Science Class 7 – Chapter 1 – Nutrition in Plants- NCERT Exercise solution (Question-Answer) ended👍👍👍

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