Action spectrum of photosynthesis was discovered by

Calvin

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Engelman

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Blackman

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Hill

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Solution

The correct option is B Engelman
Engelman discovered the action spectrum of photosynthesis in 1833. He found that bacteria accumulated in the region of blue and red light of split spectrum. He thus discovered the effect of the different wavelength of the light on photosynthesis and at that time he discovered the first action spectrum of photosynthesis.
So, the correct option is B.

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