ECOLOGY
PROPERTIES OF POPULATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The birth rate becomes higher than the death rate
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the birthrate becomes lower than the death rate
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the birthrate and death rate remain the same
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Detailed explanation-1: -If the birth rate is larger than the death rate, then the population grows. If the death rate is larger than the birth rate, what will happen to the population? The population size will decrease. If the birth and death rates are equal, then the population size will not change.
Detailed explanation-2: -If there are comparatively more young adults than older adults where mortality is highest, then even at replacement fertility levels (when each woman has about an average of two children) there will be more births than deaths.
Detailed explanation-3: -The younger a population, the faster that population grows because the birth rate is higher and the death rate is lower (Fig. 13-1). When birth rate is expressed per age group, it is called the standardized birth rate, as opposed to the crude birth rate of the total population.
Detailed explanation-4: -Natural increase. Put simply, natural increase is the difference between the numbers of births and deaths in a population; the rate of natural increase is the difference between the birthrate and the death rate.