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Question
Which group of organisms are not constituents of a food chain?
- Grass, lion, rabbit, wolf
- Plankton, man, fish, grasshopper
- Wolf, grass, snake, tiger
- Frog, snake, eagle, grass, grasshopper
Options
(i) and (iii)
(iii) and (iv)
(ii) and (iii)
(i) and (iv)
Solution
(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.
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