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Which pigment system is inactivated in red drop?

1. PS-I and PS-II
2. PS-I
3. PS-II
4. None of these

Correct answer: PS-II

Solution

Red drop refers to the sharp decrease in photosynthetic rate in far-red light, which mainly affects photosystem II. PSII is less effective under far-red wavelengths, so its inactivation explains the drop.

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