Ratio between natality and mortality is called:

Choose the correct option for $P$ and $Q$ in the given diagram representing population density $(N)$:

Mortality is:

Which age group of organisms constitutes the pre-reproductive population?

If birth rate is $100,$ death rate is $10,$ and the number of individuals in the population group is $1000,$ then what will be the percentage of natural growth rate (in $, \%$)?

If $4$ individuals in a laboratory population of $40$ fruitflies died during a specified time interval (i.e.,a week),the death rate in the population during that period is