Biology
Grade-9
Easy
Question
Observe the chart and choose the correct equation.
- Population size=(I+E)-(N+M)
- Population size=(N+I)-(M+E)
- Population size=(N+I)-(E-M)
- Population size=(M+E)-((N+I)
Hint:
Population size=(N+I)-(M+E)
The correct answer is: Population size=(N+I)-(M+E)
- Population is determined by many factors.
- Natality which is birth rate and immigration increases the population whereas mortality (death rate) and emigration decreases it.
- Therefore the sum total of mortality and emigration subtracted from the sum total of natality and emigration gives the current population of a place.
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