Q. Assertion (A) Photosynthesis is a physicochemical process.
Reason (R) During photosynthesis, conversion of light energy is a physical process, while synthesis of glucose is a chemical process.

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Solution:

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Photosynthesis is a physicochemical process. This is because photosynthesis involves the conversion of light energy, which is a physical process and leads to the formation of glucose which is a chemical process.