What is the effect on the flowering of a plant if a flash of red light is followed by a flash of far-red light?

Flowering is increased

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Flowering is decreased

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Flowering is stopped

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Effect of red flash is reversed

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Solution

The correct option is D Effect of red flash is reversed
If a plant is flashed with red light initially and then flashed with far red light, the effect of red light is reversed. It is due to the presence of phytochromes which are present in plants as the pigments for light absorption. It has two forms, Pr and Pfr. The range of absorption in wavelength is from 660 nm to 730 nm.

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