In the given figure,what do $a$ and $b$ represent respectively?

Which of the following can be taken as the most convincing factor for indicating the rapid increase in population growth of a country?

The integral form of the exponential growth equation is $N_{t} = N_{0} e^{rt}$. Identify $A, B, C$,and $D$ from the given equation where:
$A$: Population density after time $t$
$B$: Population density at time zero
$C$: Intrinsic rate of natural increase
$D$: The base of natural logarithms $(2.71828)$

The human population growth curve of today is:

If $N$ is the population density at time $t$,then its density at time $t+1$ can be calculated as . . . . . . .

Give scientific reasons: When a plant culture is grown in a limited amount of nutrient medium,growth is slow in the initial stage (lag phase). It increases rapidly in the exponential phase and again slows down in the stationary phase.