Assertion :Except sciophyte and plants of dense forest, light is rarely a limiting factor in nature. Reason: Light saturation occurs at 10 percent of full summer sunlight.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Sciophytes are the plants that grow in shade or basically shade-loving plants. The rate of photosynthesis increases with the increase in light intensity but up to a limit. At 10% of the sunlight, saturation of light occurs so photosynthesis rate is not affected after that. Thus, light is rarely a limiting factor in nature except for sciophytes and plants of the dense forest. Hence, assertion and reason are correct and the reason is the correct explanation for the assertion.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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