Q.

Red drop proposed by Emerson and Arnold indicated that:

Moderate

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Photosynthetic yield was minimum when monochromatic beam of more than 680nm was supplied to the plant.

Photosynthetic yield was maximum when monochromatic beam of more than 680nm was supplied to the plant.

Photosynthetic yield was minimum when monochromatic beam of 680 nm was supplied to the plant.

Photosynthetic yield was minimum when polychromatic beam was supplied to the plant.

answer is 1.

(Detailed Solution Below)

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Detailed Solution

Supplying light of wavelength more than 680 nm result into functioning of only PSI but not PSII. It produced only ATP but not NADPH2. Hence there is decline in O2 evolution and CO2 fixation resulted in decrease in photosynthesis.

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