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The region of the spectrum used for photosynthesis by plants lies between

(a) 400 and 700 nm Correct
(b) 100 and 400 nm Your answer
(c) 1000 and 1400 nm Your answer
(d) 700 and 1000 nm Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

Plants use light between 400 nm and 700 nm for photosynthesis (photosynthetically active radiation, PAR).

Why the other options are wrong

(b) · your answer 100-400 nm is ultraviolet light.
(c) · your answer 1000-1400 nm is infra-red light.
(d) · your answer 700-1000 nm is far-red and infra-red light.

NCERT point: PAR is only a part of the sunlight that reaches a leaf.

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