Assertion :The upper surface of the leaf is darker than the lower surface. Reason: Spongy mesophyll contains fewer chloroplasts than palisade mesophyll cells

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
The palisade mesophyll lies below the upper epidermis. The spongy parenchyma or spongy mesophyll lies between the lower epidermis and the palisade parenchyma. The spongy mesophyll cells contain chloroplasts but fewer than present in the palisade parenchyma. As the chloroplasts are more abundant in the compact palisade mesophyll cells than the loosely arranged mesophyll cells, the upper surface of the leaf appears deeper green as compared to the lower surface.
So the correct answer is 'A'.

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