Question

Zero population growth means,
(A) No immigration
(B) No emigration
(C) No new births
(D) Number of births and deaths equal.

Answer 1

Hint: Growth of the population is defined as the increasing number of individuals or creatures in a population. When resources are unlimited in a population, the population growth curve becomes exponential and thus makes a J-shaped curve.

Complete answer:
Let’s discuss the question and find the proper answer.
- Immigration: Immigration means an animal establishes a home in a habitat because it has resources it can utilize or because the habitat is ideal for them.
- Emigration: Emigration means an animal leaves its home because the habitat is no longer ideal for them and they need to find a more suitable environment.
- The total number of birth individuals per unit of time is called natality. When in a population no new birth occurs there will create a decrease in the population growth curve.
- When in a population, the number of birth individuals becomes equal to the number of dead individuals, there will be no change in the growth of the population. This is termed as zero population growth.
Hence Option ‘D: Number of births and deaths equal’ is the correct answer.

Note: There are mainly two types of population growth curves present in the population. These include the logistic growth curve and the exponential growth curve. The exponential growth curve is J-shaped in structure while the logistic growth curve is sigmoidal and S-shaped in structure.