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Anoxygenic photosynthesis is characteristic of

  • (a) Spirogyra Your answer
  • (b) Rhodospirillum Correct
  • (c) Ulva Your answer
  • (d) Chlamydomonas Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

Rhodospirillum is a purple non-sulphur bacterium. It photosynthesises without splitting water, so no oxygen is released. This is anoxygenic photosynthesis.

Why the other options are wrong

  • (a) · your answer Spirogyra is a green alga with chlorophyll a; it splits water and releases O2.
  • (c) · your answer Ulva is a green alga; its photosynthesis is oxygenic.
  • (d) · your answer Chlamydomonas is a green alga; its photosynthesis is oxygenic.
NCERT point: Photosynthetic bacteria (purple and green bacteria) carry out anoxygenic photosynthesis; cyanobacteria, algae and plants carry out oxygenic photosynthesis.
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