The growth rate is highest in

Red light

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White light

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Green light

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None of the above

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Solution

The correct option is A White light
Relative growth rate (RGR) is the measure used to quantify the speed of plant growth. It is measured as the mass increase per above ground biomass per day. Maximum growth rate is shown when white light is supplied. Light is always the limiting factor in photosynthesis.
Thus, the correct answer is option B.

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