The exponential growth model assumes that resources are unlimited in the habitat. Under such conditions, a population grows at a rate proportional to its size, leading to a J-shaped curve. This is rarely observed in nature over long periods.
The logistic growth model accounts for environmental resistance. It recognizes that resources (food, space, etc.) are finite. As the population density increases, the growth rate slows down and eventually levels off at the carrying capacity ($K$), resulting in a sigmoid or S-shaped curve.
Assertion A is correct because the logistic model reflects the reality of limited resources. Reason R is also correct because the fundamental biological constraint on population growth is the finite nature of resources. Since the limitation of resources is the specific reason why the logistic model is more realistic than the exponential model, R is the correct explanation for A.
Final Answer: Both A and R are correct and R is the correct explanation of A
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