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Population Density

A biologist s...

Question

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

A

5

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B

0(zero)

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C

10

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D

15

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Solution

The correct option is B 0(zero)
Net increase in population = (average natality + immigration) - (averagemortality + emigration)

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

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Q. Multiple Choice Questions.
A biologist studies 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

Q. Biologist studied the population of rats in a barn initially the number of rate were 200 now 15 new rats were born and average mortality was 20. So, what will be the final population?

Q. A biologist studied the population of rats in a barn. Initially the number of rats were

200

15

new rats were born and mortality was

20

. So, what will be the final population?

Q. A biologist studied the population of rats in a barn. He found that in a year the number of rats increases to 250 from an initial population of 200. What is the birth rate for the given population?

Q. Fill in the blanks
1. ___(i) ___ is the rate at which new individuals are added to a population by reproduction.
2. ___ (ii) ___ is the rate at which individuals are lost by death.
3. ___ (iii)

refers to individuals moving away from each other.
4. ___ (iv)

refers to individuals moving out of a population.
5.

refers to individuals moving into a population.

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