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JAMB Biology 2011 Question 38

Question 38

Population Ecology

Which of the following groups of environmental factors are density-dependent?

  1. A.Food, predation, disease and accumulation of metabolites.
  2. B.Temperature, food, disease and light.
  3. C.Food, salinity, accumulation of metabolites and light.
  4. D.Temperature, salinity, predation and disease.
Show the answer and explanation

Answer: A (Food, predation, disease and accumulation of metabolites.)

Explanation

Density-dependent factors get stronger as a population becomes crowded, such as shortage of food, predation, disease and build-up of wastes. Temperature, light and salinity act regardless of numbers.