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The action spectrum obtained by Engelmann roughly resembled the absorption spectra of

(a) phytochrome Your answer
(b) chlorophyll a and b Correct
(c) carotenoids only Your answer
(d) phycobilins Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

Engelmann's action spectrum roughly resembled the absorption spectra of chlorophyll a and b, with peaks in the blue and red regions.

Why the other options are wrong

(a) · your answer Phytochrome is a light receptor for growth, not a photosynthetic pigment.
(c) · your answer Carotenoids absorb blue-violet only; the action spectrum also peaked in red.
(d) · your answer Phycobilins are not the pigments NCERT compares here.

NCERT point: This showed that chlorophylls drive photosynthesis.

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