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In a pond there were 400 frogs last year...

In a pond there were 400 frogs last year and through reproduction 200 frogs are added taking current population to 600. The birth rate is

A

`0.4`

B

`0.5`

C

`0.6`

D

`0.7`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-ORGANISMS AND POPULATIONS-EXERCISE-I (POPULATIONS)
  1. Which one of the following organisms reproduces sexually only once in ...

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  2. The number of new individuals produced in a unit time, per unit popula...

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  3. In a pond there were 400 frogs last year and through reproduction 200 ...

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  4. The status ofa population, whether it is growing, stable, or declining...

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  5. Organisms represented at the top of an age pyramid are

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  6. In an age pyramid, which age group is represented at the bottom ?

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  7. In a growing population of a country.

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  8. Total number of individuals per unit area of unit volume is called

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  9. In a population of 2,500 whose intrinsic rate of natural increase (r) ...

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  10. Choose the incorrect statement.

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  11. The size of a population increases if

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  12. Which of the following factors has a negative effect on the population...

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  13. In a population of a habitat in one year 200 births, 150 deaths, 200 e...

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  14. Exponential growth is observed in a population when

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  15. In a population per capita birth rate is 0.15 and per capita death rat...

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  16. The maximum possible number of individuals that a habitat can support ...

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  17. The phase of the population growth where natality is equal to mortalit...

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  18. In logistic growth curve, the initial stage of the curve is called

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  19. In the equation N(t)=N(0)e^(rt),'e' is

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  20. Which of the following is an incomplete count to estimate population d...

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