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WAEC Biology 2021 Question 32

Question 32

Feeding Relationships and Energy Flow

The illustration below is a food chain. Grass → grasshopper → domestic fowl → hawk
What would happen if the population of domestic fowl decreases? The population of

  1. A.grasshoppers would decrease
  2. B.hawks would increase
  3. C.grasshoppers would increase
  4. D.grasses available to grasshoppers would increase.
Show the answer and explanation

Answer: C (grasshoppers would increase)

Explanation

Fewer fowls means fewer grasshoppers are eaten, so the grasshopper population rises (and hawks, losing food, fall).