Question

Which group of organisms are not constituents of a food chain?

1. Grass, lion, rabbit, wolf
2. Plankton, man, fish, grasshopper
3. Wolf, grass, snake, tiger
4. Frog, snake, eagle, grass, grasshopper

Options

• (i) and (iii)

• (iii) and (iv)

• (ii) and (iii)

• (i) and (iv)

Answer 1

(ii) and (iii)

Explanation -

The groups of organisms in listed in (i) and (iv) constitute food chains:

(i) Grass → Rabbit → Wolf → Lion

(iv) Grass → Grasshopper → Frog → Snake → Eagle

(ii) Three organisms (plankton, fish and man) constitute an aquatic food chain and grasshopper is a part of terrestrial food chain.

(iii) Three organisms (wolf, snake and tiger) are carnivores and grass is producer. Since there is no herbivore, a food chain cannot be constituted.