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The "red drop" in photosynthesis was observed by

  • (a) Emerson Correct
  • (b) van Niel Your answer
  • (c) Calvin Your answer
  • (d) Blackman Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Emerson observed red drop: a sharp fall in photosynthesis in light beyond 680 nm. Together with the enhancement effect, it led to the idea of two photosystems.

Why the other options are wrong

  • (b) · your answer Van Niel worked on bacterial photosynthesis and the source of O2.
  • (c) · your answer Calvin traced the path of carbon fixation.
  • (d) · your answer Blackman gave the law of limiting factors.
NCERT point: Cyclic photophosphorylation occurs when only light of wavelength beyond 680 nm is available.
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