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Standard X
Biology
Question

In a population there were 20 individuals. Now birth rate is 2 and death rate is zero. What will be the existing number of individuals in the population?
  1. 20
  2. 22
  3. 18
  4. Zero (0)

A
22
B
18
C
20
D
Zero (0)
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Solution
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Population growth rate (PGR) is the increase in a country's population during a period of time, usually one year, expressed as a percentage of the population at the start of that period. It reflects the number of births and deaths during a period and the number of people migrating to and from a country.
As there are 20 individuals, birth rate is 2 and death rate is 0, also there is no migration. Therefore, 20+2-0=22.
Therefore, the correct answer is option B.

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