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Which conclusion of van Niel was later proved by radioisotope techniques?

  • (a) The O2 evolved by green plants comes from water, not from CO2. Correct
  • (b) The first product of CO2 fixation is a 3-carbon acid. Your answer
  • (c) Chlorophyll is located in chloroplasts. Your answer
  • (d) Light saturation occurs at 10% of full sunlight. Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Van Niel inferred that the O2 evolved by green plants comes from water, not CO2. This was later proved using radioisotope (18O) techniques.

Why the other options are wrong

  • (b) · your answer The 3-carbon first product was found by Calvin, not proposed by van Niel.
  • (c) · your answer The location of chlorophyll in chloroplasts was shown by Sachs.
  • (d) · your answer Light saturation data are not from van Niel.
NCERT point: Isotope labelling confirmed the source of O2.
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