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Q.

Study the graph of light intensity on rate of photosynthesis and choose incorrect option.

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a

Region B is transition point for limiting factor 

b

In region C rate of photosynthesis is not increasing with increase in light

c

In region A light is not limiting factor 

d

D is point beyond which light is not limiting factor

answer is A.

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Detailed Solution

There is a linear relationship between incident light and CO2 fixation rates at low light intensities. At higher light intensities, gradually the rate does not show further increase as other factors become limiting. Therefore, in region A light is a limiting factor.

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