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Question

Which of the following would necessarily decrease the density of a population in a given habitat?

A
Natality > mortality
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B
Immigration > emigration
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C
Mortality and emigration
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D
Natality and immigration
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Solution

The correct option is B Mortality and emigration
Population density in a given habitat is influenced by four processes:
- Natality : It is the number of birth in a population during a given period of time,
- Mortality : It is the number of deaths in a population during a given period of time.
-Immigration : Number of individuals coming from other habitats in a given period of time
-Emigration : Number of individuals exiting form a given population in a given period of time.
Mortality and emigration will, therefore decrease the population density while natality and immigration will increase it.
So, the correct answer is 'Mortality and emigration'.

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