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) $(250+20)-(240+30)=270-270=0$
