NEET 2001 Biology question

Which pigment system inactivated in red drop : -

(1)PS-I and P.S-II
(2)PS - I
(3)PS - IICorrect
(4)None

Answer: (3)

Solution

Emerson found that the quantum yield of photosynthesis drops sharply when the light wavelength is longer than about 680 nm (far-red) even though chlorophyll a still absorbs there: this is the red drop. At these wavelengths only PS I

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Question ID VK-088864