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  4. In a pond there are 20 lotus plants last year and through reproduction 8 new plants are added, taking the current population to 28. What is the birth rate?

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Q. In a pond there are $20$ lotus plants last year and through reproduction $8$ new plants are added, taking the current population to $28$. What is the birth rate?

Organisms and Populations

Solution:

$Rate= \frac{Change\, in\, population}{Orignal population}=\frac{28-20}{40}$
$=\frac{8}{20} =0.4$ individual per fruitfly per week