Question

Which of the following is not a feature of a J-shaped growth form of population?

• A. It is found in stable type of population.
• B. Exponential phase is very rapid.
• C. A crash phase occurs at the end of the growth.
• D. Environmental resistance does not operate.

Answer 1

Answer: (A)

It is found in stable type of population.

J-shaped growth curve is a curve on a graph that records the situation in which, in a new environment, the population density of an organism increases rapidly in and exponential or logarithmic form, but then stops abruptly as environmental resistance or some other factor suddenly becomes effective. The actual rate of population change depends on the biotic potential and population size. It may be summarized mathematically as

dN/dT= rN (with a definite limit on N)

where, N is the number of individuals in the population

t is time

and, r is a constant representing the intrinsic rate of increase (biotic potential) of the organism concerned.

The population grows exponentially, and after attaining the peak value, the population may abruptly crash. This increase in population is continued till large amount of food materials exist in the habitat.

So the correct option is 'it is found in stable type of population'.