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11.Organisms and Populations
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If birth rate is $100 ,$ death rate is $10$ and number of individuals in population group is $1000 ,$ then what will be the percentage of natural growth rate?
A
$0.09\, \%$
B
$9.0\, \%$
C
$0.9 \,\%$
D
$90\, \%$
Solution
The increase in number of individuals in particular time period is termed as 'birth rate' or 'natality', while the individuals dying over a time period is known as 'mortality' or 'death rate'.
Birth rate $=100$
Death rate $=10$
Number of individuals in a population $=1000$
Natural growth rate $=100-10=90$
So, percentage of growth rate $=\frac{90}{1000} \times 100=9 \,\%$
Standard 12
Biology
