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(A) The phenomenon described is known as the Emerson Enhancement Effect. When plants are exposed to red light alone,the rate of photosynthesis is lowe

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Far-red light

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(A) The phenomenon described is known as the Emerson Enhancement Effect. When plants are exposed to red light alone,the rate of photosynthesis is lower than the sum of the rates observed when exposed to shorter wavelengths. However,when red light is supplemented with far-red light,the rate of photosynthesis increases significantly,exceeding the sum of the rates of the two individual light exposures. This synergistic effect demonstrates the cooperation between the two photosystems,$PS-I$ and $PS-II$,in the light-dependent reactions of photosynthesis.

The rate of photosynthesis declines in the presence of red light and is increased to normal level when red light is supplemented with

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