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Photosynthesis cannot continue for a longer period,if only cyclic photophosphorylation is taking place during light reaction.This is because

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there is no evolution of oxygen

photosystem-I stops getting excited at a wavelength of light beyond 680 nm

only ATP is formed, $N A D P H^{+} + H^{+}$ is not formed

there is unidirectional cyclic movement of the electrons

answer is A.

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Detailed Solution

Photosynthesis cannot continue for long if during light reaction, only cyclic photophosphorylation takes place. This is because only ATP is formed, NADPH+H⁺ is not formed. NADPH+H⁺ is absolutely necessary for CO₂ reduction in Calvin cycle.

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