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Question

Which group of organisms together will not form a food chain?
I. Grass, lion, rabbit
II. Plankton, leopard, hawk
III. Lion, grass, snake, tiger
IV. Frog, snake, eagle, grass, grasshopper
  1. I and III
  2. III and IV
  3. II and III
  4. I and IV


Solution

The correct option is C II and III
Food chains formed by group I and IV are as follows:
Group I - Grass rabbit  lion
Group IV - Grass  grasshopper  frog  snake  eagle

Group II contains hawk and leopard as consumers. Both hawk and leopard do not feed directly on planktons (the producers). Thus, a food chain cannot be formed in this case.

Snakes, tigers and wolves are carnivorous, they never feed on grass. So, a food chain cannot be formed by group III as well.

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