Question

In a pond, last year there were 30 lotus plants. Through reproduction, 25 new lotus were added in one year while 8 plants died. The birth and death rates for the lotus populations respectively are ______ and ________ individuals per lotus per year.

• A. 0.83, 0.26
• B. 0.26, 0.83
• C. 0.25, 0.80
• D. 0.80, 0.25

Answer 1

The correct option is A 0.83, 0.26

.Total number of plants (in the beginning ) = 30
New plants added by reproduction = 25
Birth rate (of a population)
$\frac{Newplants}{Totalnumberofplants}=\frac{25}{30}$
= 0.83 individuals per lotus per year
Number of plants = 8
Death rate (of a population) = $\frac{Numberfdeaths}{Totalnumberofplants}$
=$\frac{8}{30}$ =0.26 individuals per lotus per year.