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Oxygenic photosynthesis occurs in

  • (a) Chlorobium Your answer
  • (b) Oscillatoria Correct
  • (c) Rhodospirillum Your answer
  • (d) Chromatium Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

Oscillatoria is a cyanobacterium (blue-green alga). Cyanobacteria have chlorophyll a and two photosystems like plants, so they split water and release oxygen.

Why the other options are wrong

  • (a) · your answer Chlorobium is a green sulphur bacterium; it uses H2S and releases no O2.
  • (c) · your answer Rhodospirillum is a purple non-sulphur bacterium; its photosynthesis is anoxygenic.
  • (d) · your answer Chromatium is a purple sulphur bacterium; its photosynthesis is anoxygenic.
NCERT point: Cyanobacteria are the only prokaryotes that carry out oxygenic photosynthesis.
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