Action spectrum of photosynthesis was first studied by

Blackman

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Van mayer

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Engelmann

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Mayerhoff

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Solution

The correct option is C Engelmann
An action spectrum is the rate of a physiological activity plotted against wavelength of light.
Action spectrum of photosynthesis was first studied by Engelmann, by splitting light into its components using a prism and illuminating Cladophora placed in a suspension of aerobic bacteria.
Blackman proposed the the law of limiting factors in 1905.

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