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.

Question

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. (A) 0.1 (B) 0.25 (C) 2.25 (D) 1.75

Tardigrade Admin · Accepted Answer

Natality refers to the number of births during a given period in a population that is added to the initial density.
Birth rate =

\frac{Δ N}{N Δ 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

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.

0.1

0.25

2.25

1.75

Natality refers to the number of births during a given period in a population that is added to the initial density. Birth rate = NΔtΔN​ where ΔN = change in the number of individual N = number of organism t = time Δ = thing changing Birth rate = 2025−20​=205​=0.25