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Light saturation for photosynthesis occurs at about

(a) 10% of full sunlight Correct
(b) 1% of full sunlight Your answer
(c) 100% of full sunlight Your answer
(d) 50% of full sunlight Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

NCERT states that light saturation occurs at about 10 per cent of full sunlight. Beyond this, more light does not increase photosynthesis.

Why the other options are wrong

(b) · your answer 1% is too low; the rate still rises above it.
(c) · your answer Saturation is reached well before full sunlight.
(d) · your answer Saturation is reached at about 10%, not 50%.

NCERT point: Very high light can damage chlorophyll and reduce photosynthesis.

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