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A biologist studied the population of ra...

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 :

A

15

B

5

C

zero

D

10

Text Solution

Verified by Experts

The correct Answer is:
C
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MODERN PUBLICATION-ORGANISM AND ENVIRONMENT-EXERCISE
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  2. A sedentary sea anemone gets attached to the shell lining of hermit cr...

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

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  4. Name the branch of ecology which deals with study of a single species.

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  5. Which is the lowest level of ecological organisation ?

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  6. Which is the highest level of ecological organisation ?

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  7. What term is used for natural place of living of an organism ?

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  8. What are ecological adaptation of succulents ?

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  9. What term is used for birth rate ?

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  10. In what type of ecological interaction both partners are benefited ?

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  11. In what type of species interaction Species-A is benefited and Species...

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  12. In what type of species interaction Species-A is benefited and Species...

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  13. In what type of species interaction Species-A and Species-B is neither...

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  14. is a group of organisms of same species living in a particular area.

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  15. Plants growing on saline soil are called.

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  16. Plants growing on sand and gravel are called.

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  17. Plants growing on acidic soil are called.

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  18. The inherent maximum capacity of organism to reproduce in number is te...

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  19. In a growing population the age pyramid is shaped.

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  20. When the population is declining, the age pyramid is shaped.

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