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On a banyan t...

Question

On a banyan tree, there were 25 crows last year. 10 young ones are added to the population this year. The birth rate of crows in this population is

A

1.4

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B

0.71

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C

2.5

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D

0.4

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Solution

The correct option is D 0.4
The birth rate is the change in number of individuals of a population due to live births in a year. It can be expressed as:

Birth rate = Number of individuals added/Initial size of population

In the given population,
Initial size of the population = 25
Number of individuals added = 10

Hence, birth rate = 10/25 = 0.4

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