Action spectrum of photosynthesis was described by

Robin Hill

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Julius von Sachs

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Joseph Priestley

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T.W. Engelmann

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Solution

The correct option is D T.W. Engelmann
Action spectrum is the graphical representation of rate of photosynthesis against wavelength of light.
T.W. Englemann demonstrated that the process of photosynthesis was optimum in the blue and red regions of the electromagnetic spectrum. This roughly corresponds to the absorption spectra of chlorophyll pigments a and b present in the green leaves.
Robin Hill was involved in the demonstration of Hill reaction (light reaction) of photosynthesis.
Around 1854, Julius von Sachs found that glucose is produced in the plants as they grow using the process of photosynthesis.
Joseph Priestley discovered oxygen and also discovered that plants discharge oxygen into the air during photosynthesis.

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