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:

  • Option 1)

    zero

  • Option 2)

    10

  • Option 3)

    15

  • Option 4)

    05

 

Answers (2)

As we learnt in concept

B = 250                                               \therefore Net Increase

I = 20                                                   = 250+20 - (240+30) = 0

D = 240

E = 30


Option 1)

zero

This option is correct.

Option 2)

10

This option is incorrect.

Option 3)

15

This option is incorrect.

Option 4)

05

This option is incorrect.

1

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