Q.

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

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya

a

zero

b

10

c

15

d

05

answer is B.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

detailed_solution_thumbnail

Population growth = (Natality + Immigration) – (Mortality + Emigration)

                                              = (250+20) – (240+30) 

                                              = 270 – 270 = 0

Watch 3-min video & get full concept clarity

tricks from toppers of Infinity Learn

score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon
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