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Photosynthesis is described in NCERT as a

(a) biological process that does not need energy Your answer
(b) physico-chemical process Correct
(c) purely chemical process Your answer
(d) purely physical process Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

NCERT calls photosynthesis a physico-chemical process: light energy (physical) is absorbed and used to drive chemical reactions that make food.

Why the other options are wrong

(a) · your answer Photosynthesis needs energy, which comes from light.
(c) · your answer It is not purely chemical; light absorption is a physical step.
(d) · your answer It is not purely physical; chemical bonds are made in sugars.

NCERT point: Green plants use light energy to drive the synthesis of organic compounds.

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