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  4. In a pond, the number of lotus plants increases from 20 to 25 in one year. Then, the birth rate is offspring per lotus per year.

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Q. In a pond, the number of lotus plants increases from 20 to 25 in one year. Then, the birth rate is ____ offspring per lotus per year.

NTA AbhyasNTA Abhyas 2020

Solution:

Natality refers to the number of births during a given period in a population that is added to the initial density.
Birth rate = $\frac{\Delta N}{N \Delta t}$
where ΔN = change in the number of individual
N = number of organism
t = time
Δ = thing changing
Birth rate = $\frac{25-20}{20}$=$\frac{5}{20}$=$0.25$