Question

Which are density-dependent factors that limit population size?
I. Disease
II. Space
III. Earthquake

• A. I only
• B. II only
• C. III only
• D. I and II only
• E. II and III only

Answer 1

Answer: (D)

I and II only

Population density is the number of individuals per unit area.

I. Disease is a density dependent factor because more the number of individuals are there in a given area, more is the chances of people getting affected by the disease.

II. Space is the area where any activity can be carried out. More the number of individuals in a given area, less will be the space. Hence, it is also a density dependent factor.

III. Earthquake is a natural calamity that occurs due to the tactic movement of plates under the earth's surface. It is neither dependent on a population size, nor the area. It happens suddenly at its own. Hence, it is not a density dependent factor.

So, the correct answer is 'I and II only'.