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Which of the following organisms carries out anoxygenic photosynthesis?

  • (a) Chlamydomonas Your answer
  • (b) moss Your answer
  • (c) purple sulphur bacterium Correct
  • (d) maize Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

Purple sulphur bacteria use H2S instead of water as the electron donor, so they release no O2: anoxygenic photosynthesis.

Why the other options are wrong

  • (a) · your answer Chlamydomonas is a green alga; its photosynthesis is oxygenic.
  • (b) · your answer Mosses are green plants with oxygenic photosynthesis.
  • (d) · your answer Maize is a green plant with oxygenic photosynthesis.
NCERT point: Van Niel used these bacteria to show that O2 in plants comes from water.
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