Which of the following lights, is least effective during photosynthesis?

Red

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Green

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Blue

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Infra-red

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Solution

The correct option is B Green
Chlorophyll, which is involved in photosynthesis is green in colour. Therefore it reflects green wavelengths of light and does not absorb them.
Hence, green light is least effective for photosynthesis.

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Question 04
Which light range is most effective in photosynthesis?
(a) Blue (b) Gree (c) Red (d) Violet

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