Question

Which of the following factors directly affect the size of a population? Note: You can select multiple answers. Birth (number of new individuals born each season). Death (number of individuals who die) Diversity (biological diversity and genetic diversity) Emigration (number of individuals leaving the population) Health (how healthy the members of the population are) Immigration (number of individuals from another population joining the population of interest)

Answer 1

Answer-

The factors that directly affect the population size are-

a) Birth; b) Death; c) Immigration; d) Emigration.

Population is generally a group of individuals of a particular species occupying a particular area at a specific time. Total size is generally expressed as the number of individuals in a population. More informative are estimates of density, the number per unit area of environment.

The changes in population size over time can be calculated by adding birth (B) and immigrant number (I) to the original population and subtracting the number of death (D) and emigrant number (E).

So, Nt+1 = Nt + B + I - D - E

Some other factors indirectly affect the population size. They are natural calamity, health, disease, mutation etc.