The Emerson enhancement effect and the red dr | vedclass

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(A) The $Red$ $Drop$ effect refers to the sharp decrease in the quantum yield of photosynthesis when the wavelength of light is increased beyond $680

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Two photosystems operating simultaneously.

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(A) The $Red$ $Drop$ effect refers to the sharp decrease in the quantum yield of photosynthesis when the wavelength of light is increased beyond $680 \ nm$ (far-red region). Robert Emerson observed that when light of a shorter wavelength (red light) was provided simultaneously with far-red light,the rate of photosynthesis increased significantly,which is known as the $Emerson$ $Enhancement$ $Effect$. These observations led to the conclusion that two distinct photochemical systems,known as $Photosystem$ $I$ ($PS$ $I$) and $Photosystem$ $II$ ($PS$ $II$),operate simultaneously to drive photosynthesis efficiently.

The Emerson enhancement effect and the red drop phenomenon were instrumental in the discovery of which of the following?

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