The declining phase of a population occurs when

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.

In India,the human population has a large number of young individuals. This is because of:

If the population density at time $t$ is $N_t$,then the population density at time $t+1$ is given by:

The formula for exponential population growth is

The population growth curves are given below. Identify the equations for $P$ and $Q$.