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

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(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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