Biology 30 – Populations Practice Test

In a closed population, the change in population size is determined by which of the following?

Births − Deaths Births + Deaths Immigration − Emigration Births + Immigration − Deaths − Emigration

Correct Answer:

Births − Deaths

Explanation:

In a closed population, the number of individuals changes only due to births and deaths. There is no movement of individuals across the population boundary, so immigration and emigration are zero. Therefore, the net change in population size is births minus deaths. If births exceed deaths, the population grows; if deaths exceed births, it declines; if they are equal, the population remains the same. The other formulas involve migration or double-counting births and deaths, which aren’t relevant here because there’s no migration and we’re not adding those two numbers together.

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