Question: 174: If ‘ 8 ‘ Drosophila in a laboratory population of ‘ 80 ‘ died during a week, the death rate in the population is \_\_\_\_ individuals per Drosophila per week.
(1) 1.0
(2) zero
(3) 0.1
(4) 10
Answer: Option (3)
Explanation:
Death rate is defined as the number of individuals that die per individual of the population per unit time.
Here, number of deaths in one week is 8 and the total population is 80.
Death rate is calculated as \frac{8}{80}.
On simplifying, \frac{8}{80}=0.1.
Therefore, the death rate is 0.1 individuals per Drosophila per week.