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.

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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.