Organisms and Populations Question 47

47. A biologist studied the population of rats in a barn. He found that the average natality was 250 , average mortality 240 , immigration 20 and emigration 30. The net increase in population is :

[NEET 2013]

(a) 15

(b) 05

(c) Zero

(d) 10

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Answer : c

Hints & Solutions

(c) Net increase in population : (Natality + Immigration) - (Mortality + Emigration) $(250+20)-(240+30)=270-270=0$