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WAEC Biology 2011 Papers

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Question : 43

Total: 59

Assuming that a period of stable population size is followed by a period when natality increases by ten (1O) per cent and immigration increases by twenty (20) percent of population size. The population size will

be at equilibrium
increase by forty (40) per cent
begin to increase
begin to decrease

Solution:

Concept:

Population change depends on natality, immigration, emigration, and mortality. Higher natality and immigration increase population size.

Explanation:

Before the change, the population is stable because births plus immigration roughly equals deaths plus emigration.

Natality now rises by

10\%

and immigration rises by

20\%

of the population size.

This adds more individuals to the population without a corresponding increase in deaths or emigration.

As a result, the balance is disturbed and the population begins to grow.

Answer:

C. begin to increase

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