Question

The number of individuals of a species in a particular ecosystem of a given time remains constant due to:

• A. Human beings
• B. Parasites
• C. Predators
• D. Food availability

Answer 1

The correct option is C

Predators

The correct option is C.

Explanation of the correct option:

1. Predators are those that prey on and kill other animals for food.
2. Predation is a mechanism of biological control.
3. It helps to keep the population of organisms constant in a particular ecosystem.
4. If the population of predators is increased, the population of prey will be decreased as they will be fed by the predators.
5. On the other hand, reduced availability of the prey animals will in turn reduce the population of the predators due to starvation.

Explanation of the incorrect options:

Option A:

1. Humans can not make the number of individuals of a species constant in a particular ecosystem.

Option B:

1. Parasites are those organisms that remain on a host and take food from it.
2. It also can not make the number of individuals of a species constant in a particular ecosystem

Option D:

1. Food availability includes both plant foods and animal foods.
2. So, we can't say that food availability can make the number of individuals of a species constant in a particular ecosystem.

Final answer: So, The number of individuals of a species in a particular ecosystem of a given time remains constant due to predators.