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NEET 2013
Exam
NEET
Year
2013
Subject
Zoology
Chapter
Organisms and Populations

NEET 2013 · Zoology · Organisms and Populations

A biologist studied the population of rats in a barn. He found that...

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 isA biologist studied the population of rats in a barn. He found that the average natality was 250 , average mortality

Options

  1. A10
  2. B15
  3. C05
  4. DZero

Correct answer

D. Zero

Step-by-step solution

A population has birth rates and death rates. The rates are expressed as change in numbers (increase or decrease) with respect to members of the population. A biologist studied the population of rats in a barn. He found that the average natality was 250 , average mortality
In this case, the net increases in population will be Birth rate (B)+(B)+ Immigration ([)([) - Death rate (D)(D) + Emmigration (l)
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