What is the growth rate of a Paramecium population in a pool if it increases from 50 individuals to 150 individuals in one hour?

100 per hour

To determine the growth rate of the Paramecium population, we can calculate the difference in population size divided by the time elapsed.

Initial population: 50 Paramecium Final population: 150 Paramecium Time elapsed: 1 hour

Growth rate = (Final population - Initial population) / Time elapsed Growth rate = (150 - 50) / 1 Growth rate = 100 / 1 Growth rate = 100

Therefore, the growth rate of the Paramecium population is 100 per hour.

The correct option is (d) 100 per hour.