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Q.

Red drop is due to

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a

Decline in quantum yield in separate beams of red light

b

Non functioning of PS II in Far red light

c

Inhibitory effect of Red light on Ps I

d

Oxidation of chlorophyll

answer is B.

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Detailed Solution

Red drop effect discovered by Emerson is due to disruption of photochemical activity of PS II. Wavelengths beyond 700nm are useless for the process of photosynthesis, so a huge drop of inefficiency is noticed at wavelength 700nm. This phenomenon is called the red drop  effect.

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