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(C) The Emerson effect,discovered by $R$. Emerson and $C$.$M$. Lewis $(1943)$,demonstrates that the rate of photosynthesis increases significantly whe

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Photosynthesis

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(C) The Emerson effect,discovered by $R$. Emerson and $C$.$M$. Lewis $(1943)$,demonstrates that the rate of photosynthesis increases significantly when plants are exposed to both far-red light and red light simultaneously,compared to the sum of the rates when exposed to each wavelength separately. This phenomenon provided evidence for the existence of two distinct photosystems ($PS-I$ and $PS-II$) working in tandem during the light-dependent reactions of photosynthesis.

The Emerson effect explains the phenomenon of:

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