The crude number of births by a population per unit time is called:

If $10$ individuals in a laboratory population of $50$ fruit flies die during a week, then the death rate during this period is $= ........$ individuals per fruit fly per week.

Select the correct option based on the number and size of offspring produced by the following organisms:
$I -$ Oysters,$II -$ Birds,$III -$ Pelagic fishes,$IV -$ Mammals
(Many small-sized offspring) $\quad$ (Few large-sized offspring)

In a population,there are $100$ small-sized Parthenium plants and only $1$ large-sized Banyan tree. Which of these has a lower population density?

Which of the following statements is true regarding individuals of the same species?

The number of organisms in a population is added by: