Class 7 Science

Plant Nutrition NCERT Exercise Solution

Part 2

Question 7: Name the following:

  1. A parasitic plant with yellow, slender and tubular stem.
  2. A plant that has both autotrophic and heterotrophic mode of nutrition.
  3. The pores through which leaves exchange gases.

Answer: (a) Amarbel (cuscuta) is a parasitic plant. It has yellow, slender and tubular stem. It lives on large trees.

(b) Pitcher plant is autotrophic but it needs to get nitrogen from insects. That is why pitcher plant traps insects to suck their juice.

(c) Stomata are tiny pores on the surface of leaves. Exchange of gases takes place through stomata.

Question 8: Tick the correct answer:

(a) Amarbel is an example of:

  1. Autotroph
  2. Parasite
  3. Saprotroph
  4. Host

Answer: (ii) Parasite

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

  1. Cuscuta
  2. China rose
  3. Pitcher plant
  4. Rose

Answer: (iii) Pitcher plant

Question 9: Match the items given in Column I with those in Column II:

Column IColumn II
(1) Chlorophyll(a) Bacteria
(2) Nitrogen(b) Heterotrophs
(3) Amarbel(c) Pitcher plant
(4) Animals(d) Leaf
(5) Insect(e) Parasite

Answer: 1 → d, 2 → a, 3 → e, 4 → b, 5 → c

Question 10: Mark ‘T’ if the statement is true and ‘F’ if it is false:

  1. Carbon dioxide is released during photosynthesis.
  2. Plants which synthesise their food themselves are called saprotrophs.
  3. The product of photosynthesis is not a protein.
  4. Solar energy is converted into chemical energy during photosynthesis.

Answer: (i) False: Oxygen is released during photosyntheis.

(ii) False: Plants which synthesize their food are called autotrophs.

(iii) True: The product of photosynthesis is carbohydrate.

(iv) True

Question 11: Choose the correct option from the following:

(a) Which part of the plant gets carbon dioxide from the air for photosynthesis?

  1. Root hair
  2. Stomata
  3. Leaf veins
  4. Sepals

Answer: (ii) Stomata

(b) Plants take carbon dioxide from the atmosphere mainly through their:

  1. Roots
  2. Stem
  3. Flowers
  4. Leaves

Answer: (iv) Leaves