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A: Environmental resistance operate to s...

A: Environmental resistance operate to slow down exponential phase in logistic population.
R: Crash phase does not occur in this populations.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion

B

It both Assertion & Reason are true but the reason is not the correct explanation of the assertion

C

If Assertion is true statement but Reason is false

D

If both Assertion and Reason are false statements

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion and reason question, we need to analyze both statements provided: **Assertion (A):** Environmental resistance operates to slow down the exponential phase in logistic population. **Reason (R):** Crash phase does not occur in this population. ### Step-by-Step Solution: 1. **Understanding Logistic Population Growth:** - Logistic population growth is characterized by an S-shaped (sigmoidal) curve, which includes three phases: lag phase, log (exponential) phase, and stationary phase. The growth starts slowly, accelerates during the log phase, and eventually levels off as resources become limited. 2. **Analyzing the Assertion:** - The assertion states that environmental resistance slows down the exponential phase in logistic populations. This is true because environmental factors (like food availability, predation, disease, etc.) limit growth as the population approaches its carrying capacity. These factors prevent indefinite exponential growth. 3. **Analyzing the Reason:** - The reason states that the crash phase does not occur in these populations. This is false. In logistic growth, after the exponential phase, if the population exceeds the carrying capacity, it can lead to a decline (or crash) in population size due to resource depletion and increased mortality. 4. **Conclusion:** - Since the assertion is true and the reason is false, the correct answer is that the assertion is true but the reason is false. ### Final Answer: The correct option is that Assertion (A) is true, and Reason (R) is false. ---
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