A: Environmental resistance operates to slow | vedclass

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(B) In a logistic growth model,the population growth is initially exponential but slows down as it approaches the carrying capacity $(K)$ due to envir

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Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.

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(B) In a logistic growth model,the population growth is initially exponential but slows down as it approaches the carrying capacity $(K)$ due to environmental resistance.Therefore,the Assertion is correct.However,a 'crash phase' (a sudden,sharp decline in population size) is characteristic of $J$-shaped growth curves (exponential growth) where resources are exhausted rapidly,not the $S$-shaped logistic growth curve.Thus,the statement that a crash phase does not occur in a logistic population is correct.Since both statements are true but the absence of a crash phase is not the reason why environmental resistance slows down the exponential phase,the correct option is $B$.

$A$: Environmental resistance operates to slow down the exponential phase in logistic population growth.
$R$: $A$ crash phase does not occur in this population.

Similar Questions

Exponential growth cannot be sustained for a long time due to:
$I.$ Limited space and nutrients
$II.$ Accumulation of toxic agents
$III.$ Unlimited space and nutrients
$IV.$ Accumulation of nutrient agents
Choose the correct combination of options:

The population of an insect species shows an explosive increase in numbers during the rainy season,followed by its disappearance at the end of the season. What does this show?

The population growth curve in most animals,except humans,is:

The study of human population growth is known as:

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$A$: Environmental resistance operates to slow down the exponential phase in logistic population growth.$R$: $A$ crash phase does not occur in this population.