Science
Which of the following groups do not constitute a food chain ?
(a) Wolf, rabbit, grass, lion
(b) Plankton, man, grasshopper, fish
(c) Hawk, grass, snake, grasshopper, frog
(d) Grass, snake, wolf, tiger
options
- (a) and (d)
- (a) and (c)
- (b) and (c)
- (b) and (d)
Environment
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Answer
(b) and (d)
Reason — Groups (b) and (d) do not form a food chain because :
(b) Plankton, man, grasshopper, fish — these organisms cannot be placed in a single linear feeding sequence since grasshopper do not feed on plankton and neither fish feeds on grasshopper so the order is ecologically inconsistent.
(d) Grass, snake, wolf, tiger — snakes do not eat grass and wolves/tigers are both top predators (they do not form a single linear chain with grass).
By contrast, the organisms in (a) and (c) can be arranged into plausible feeding sequences for example, grass → rabbit → wolf → lion in (a) and grass → grasshopper → frog → snake → hawk in (c).
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