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Mortality, Natality and Dispersal

If 8 individu...

Question

If 8 individuals in a laboratory population of 80 fruitflies died in a week, then what would be the death rate for the population for that said period?

A

8%

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B

10%

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C

1%

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D

80%

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Solution

The correct option is A 10%
Death rate is the number of death in a particular area in a particular time period per 1000 individual. It is calculated by total number of death divided by total number of population.
Death rate = Total number of death / total population x 1000
= 8 /80 x 1000 = `100 individuals per 1000 individuals per week.
Thus, the death rate is 10% per week.
Thus, the correct answer is '10%.'

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Q. (a) Following are the responses of different animals to various abiotic factors. Describe each one with the help of an example.
(i) Regulate
(ii) Conform
(iii) Migrate
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