Question

If N is population density at time t, then population density at time t+1 can be written as $N_{(t+1)}$ = $N_{\left(t\right)}$ + [(A+B) - (C+D)]
Select the correct option for A, B, C and D in the above equation.

• A. A is mortality and B is natality
• B. B is immigration and C is natality
• C. C is mortality and D is immigration
• D. A is natality and D is emigration

Answer 1

The correct option is D A is natality and D is emigration

The density of a population in a given habitat during a given period fluctuates due to changes in four basic processes, two of which are natality and immigration. Natality and immigration contribute to an increase in population density. The other two are mortality and emigration. They contribute to a decrease in population density. So, If N is the population density at time t, then its density at time t +1 is
$N_{(t+1)}$ = $N_{\left(t\right)}$ + [(A + B) – (C + D)]
Hence A is natality, B is immigration, C is mortality and D is emigration.