If the age pyramid of a population is bell-shaped,it will show:

If there were $30$ lotus plants in a pond last year and through reproduction $10$ new plants were added, taking the current population to $40$, then the birth rate = $.........$ offspring per lotus per year.

The shape of the pyramids reflects the growth status of the population. Identify the type of age pyramid represented below for human population.

$A$ group of individuals living in a particular geographical area at a particular time is called:

Which of the following factors contribute to an increase in population density?

Consider the birth rate and death rate per year in a given population.
Total population after $5$ years $\rightarrow 100$
Number of individuals dying per year $\rightarrow 10$
Number of individuals born per year $\rightarrow 20$