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Question

# If the rate of photosynthesis of a plant in the light of wavelength 680 nm is X and in the wavelength of 700 nm it is Y. And the rate of photosynthesis when both lights are applied simultaneously is Z. Then,

A
Z = X + Y
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B
Z > (X + Y)
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C
Z < (X + Y)
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D
X = Y = Z
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Solution

## The correct option is B Z > (X + Y)The Emerson effect is the increase in the rate of photosynthesis after chloroplasts are exposed to the combined red spectrum of light (upto 680 nm) and far red spectrum (more than 680 nm). This means, if the rate of photosynthesis when the plant is exposed to red light is X, and the rate of photosynthesis when the plant is exposed to far red light is Y, then the rate of photosynthesis when the plant is exposed simultaneouly to X and Y will be higher than the sum of X and Y. Here the rate of photosynthesis when the plant is exposed to combined red and far red light is Z. Hence, Z > (X + Y)

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