How are biotic potential, environmental resistance and carrying capacity related to population growth?

Explanation

(a) Biotic potential. It is the potential rate of increase or it is the physiological capacity to produce offspring. The biotic potential of human species is estimated to be about 12 per female during the reproductive period of 16 to 44 years of age. The population increases when the number of births exceeds the number of death.
(b) Environmental resistance. The factors such as shortage of food, disease, predation, environmental natural calamities which impose a check on population size constitute environmental resistance. In case the factors of environmental resistance cannot produce zero growth, the population shows rapid growth. The growth curve will take the shape of Urn. But in a world with limited resources, environmental resistance does not allow population growth to soar towards infinity.
(c) Carrying capacity. It is a measure of the feeding capacity of an environmental or ecosystem for a population of a species under a given set of conditions. The population generally stabilizes around carrying capacity. All habitats or environments can sustain only a limited size of population. This limit is called carrying capacity (K).
The carrying capacity of earth for human population is about 50 billion.