Question

A stable population is one which has got
A. No growth of population in last the decade
B. Constant rate of population growth in the last decade
C. Slow growth of population in the last decade
D. Growth of 20%in excess than the last decade

Answer 1

Hint:-Stable populations are theoretical models widely employed by demographers to represent and understand the structure, growth and evolution of human populations. It was introduced in the United Nations study world’s population.

Complete Answer:-
Stable populations have age-specific fertility and mortality rates that remain constant over time.
Population with non migratory exchanges with the surface world, subjected to invariable fertility and mortality conditions over an extended period tends towards a stable condition with an invariable age structure and rate of growth. A stationary population with a zero rate of growth may be a special example of this.
The theoretical relationships between fertility, mortality and age structure in stable populations help us to know the expansion and structure of historical populations, and may be wont to make demographic estimates.

Properties of stable populations:
A population will become stable if it experiences constant age-specific fertility and mortality rates over an extended period of your time. As a consequence, the population will develop a continuing rate of growth and can maintain a continuing age structure. The growth rate that's generated by the actual combination of a fertility and mortality schedule is formally mentioned because of the intrinsic rate of natural increase, or the stable population growth rate. For brevity, within the text that follows we simply ask it because the rate of growth and in algebraic relationships we designate it using the letter.
A constant age structure implies that the proportion of the population in each age bracket doesn't change over time. The total size of the population may change, growing or shrinking at a continuing rate, but the amount at all ages changes at precisely the same rate, so that when it is expressed as a fraction of the total this proportion does not change over time.

Stable populations with positive growth rates grow steadily over time, negative growth rates imply that the population is shrinking steadily. The special case of the stable population with zero growth is termed a stationary population - in such a theoretical population neither the proportions nor the numbers in each cohort change over time. The age structure of a stationary population is the same as that of the life table defining its mortality.
Option A is inaccurate as if there would be no growth of population, there would be no youth in upcoming years to try to work and the country won't function properly. Option c is additionally incorrect as slow growth means birth rate and death rate would almost be similar but this condition is additionally not favourable . Option d is also incorrect as growth of over 20% would increase pressure on a country's resources and there would be unemployment, food shortage and various diseases would increase and hence the country won't function properly.

Constant rate of growth of population shows stable growth. Hence, option b is correct.
 

Note:- A stable population may or might not have zero increment. We are able to have stable populations that are growing, and that we can even have stable populations that are declining.