Question

When in a population birth rate and death rate exactly balance each other, it is called as

• A. Plateau phase
• B. Acceleration phase
• C. Exponential phase
• D. Initial growth

Answer 1

The correct option is A Plateau phase

The sigmoid graph shows that the population growth of a species has three phases which are - the exponential phase, the transitional phase and the plateau phase. In the plateau phase, the population size is constant, so no more growth is occurring. This is the result of natality rate being equal to mortality rate and is caused by resources becoming scarce as well as an increase in predators, diseases and parasites.