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Question

The evidence of existence of two photosystems in light reactions of photosynthesis was given by
  1. Arnon
  2. Hill
  3. Emerson
  4. Englemann


Solution

The correct option is C Emerson

The evidence of existence of two photosystems in light reactions of photosynthesis was given by Emerson. The Emerson effect is the increase in the rate of photosynthesis after chloroplasts are exposed to light of wavelength 670 nm (deep red spectrum) and 700 nm (far red spectrum).

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