Emmerson defined 'red drop' as a decline in p | vedclass

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(D) The 'red drop' effect refers to the sharp decrease in the quantum yield of photosynthesis when plants are exposed to light with wavelengths greate

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Wavelengths greater than $680 \ nm$

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(D) The 'red drop' effect refers to the sharp decrease in the quantum yield of photosynthesis when plants are exposed to light with wavelengths greater than $680 \ nm$ (far-red light).This occurs because light at these wavelengths is primarily absorbed by Photosystem-$I$ $(PS-I)$ only,failing to excite Photosystem-$II$ $(PS-II)$,which is necessary for the complete electron transport chain.Robert Emerson observed that the rate of photosynthesis drops significantly in the far-red region of the spectrum.

Emmerson defined 'red drop' as a decline in photosynthesis,also termed the Emmerson effect. It appears at:

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