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WAEC Biology 2011 Papers

Question : 36

Total: 59

Use the information on capture-recapture method to calculate the total number of organisms in a habitat.

First capture = 200

Second capture = 120

Number of organisms with mark in second capture = 40

Validate

Solution:

The formula for estimated population is

$\;\frac{\text{No of marked in 1st capture}}{\text{No of species}} = \;\frac{\text{No of marked in 2nd capture}}{\text{no of species in 2nd capture}}$

= $\;\frac{200 \times 120}{40} = 600$

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