ECOLOGY
PROPERTIES OF POPULATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When a community reaches its maximum population number.
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When birth exceed deaths.
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When deaths exceed births.
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When a population size has been stabilized for a long time.
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Detailed explanation-1: -Population stabilization is a stage when the size of the population remains unchanged. It is also called the stage of zero population growth. Country level population stabilization occurs when births plus in-migration equals deaths plus out-migration.
Detailed explanation-2: -Zero population growth refers to a population that is unchanging – it is neither growing, nor declining; the growth rate is zero. This demographic balance could occur when the birth rate and death rate are equal.
Detailed explanation-3: -When the birth rate and death rate are equal, we have zero population growth, or the stable equilibrium phase.
Detailed explanation-4: -Maintaining the number of births at the current level is the fastest way to achieve eventual zero population growth. A population with a constant annual number of births, labeled as a quasi-stationary population, also has a near-to constant age structure that is not excessively old.
Detailed explanation-5: -Zero Population growth rate is a condition wherein the population neither grows, nor declines. It is because the number of pre-reproductive, reproductive and post-reproductive individuals are almost equal. Hence, the population size remains stable, neither growing nor declining.