Choose the correct answer from the alternatives given.
Which of the following is least effective for photosynthesis ?

Yellow light

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Blue light

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Red light

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Green light

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Solution

The correct option is D Green light
Green is the least effective color of light in driving photosynthesis, the process of converting light energy into chemical energy. Photosynthesis occurs in plants and algae using chlorophyll and because chlorophyll reflects rather than absorbs green light, green light cannot be used in the photosynthetic process.
Thus, the correct answer is 'Green light.'

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