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Oxygen is not produced during photosynthesis by

  • (a) Cycas Your answer
  • (b) green sulphur bacteria Correct
  • (c) Chara Your answer
  • (d) Nostoc Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

Green sulphur bacteria carry out anoxygenic photosynthesis. They do not split water; they use hydrogen sulphide (H2S) as the hydrogen donor, so sulphur, not oxygen, is released.

Why the other options are wrong

  • (a) · your answer Cycas is a gymnosperm, a green plant that splits water and releases O2.
  • (c) · your answer Chara is a green alga; like all green plants it releases O2.
  • (d) · your answer Nostoc is a cyanobacterium; cyanobacteria carry out oxygenic photosynthesis like plants.
NCERT point: Van Niel showed that in green plants O2 comes from water, while purple and green sulphur bacteria use H2S and release no O2.
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