Assertion :The external factors that affect photosynthesis are number , size, age and orientation of leaves, mesophyll cells and chloroplasts and the amount of chlorophyll. Reason: The internal factors that affect photosynthesis are availability of sunlight, temperature , $C O_{2}$ concentration and water

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 D Both Assertion and Reason are incorrect
photosynthesis is under the influence of several factors, both internal (Plant) and external. The plant factors include the number, size, age and orientation of leaves, mesophyll cells and chloroplasts, internal $C O_{2}$ concentration and the amount of chlorophyll.The plant or internal factors are dependent on the genetic predisposition and the growth of the plant. The external factors include the availability of sunlight, temperature, $C O_{2}$ concentration and water. During photosynthesis, all these factors simultaneously affect its rate . So, the correct answer is 'Both Assertion and Reason are incorrect'.

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Assertion :The external factors that affect photosynthesis are number , size, age and orientation of leaves, mesophyll cells and chloroplasts and the amount of chlorophyll. Reason: The internal factors that affect photosynthesis are availability of sunlight, temperature ,CO2 concentration and water