First slide

Populations

Question

There were 20 lotus plants in a pond and through reproduction eight new plants are added in two years, taking the current population to 28. How do you calculate the birth rate?

Difficult

A

$\frac{8}{28}$
B

$\frac{8}{28 \times 2}$
C

$\frac{8}{20}$
D

$\frac{8}{20 \times 2}$

Solution

The birth rate is the number of births per individual per unit time.
$b = \frac{∆ N_{n}}{N \times ∆ t} = \frac{8}{20 \times 2} = 0.2$

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