Multiple choice

Population of different organisms is kept under check by:

  1. high mortality

  2. low birth rate

  3. natural calamities

  4. food chain
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Food chains regulate populations through predator-prey relationships where predators control prey numbers and vice versa. High birth rate alone would increase population, not keep it under check. Natural calamities are unpredictable events, not a regulatory mechanism. High mortality reduces population but isn't a 'check' in the ecological sense.

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