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Oxygen is not produced during photosynthesis by

1. Green sulphur bacteria
2. Nostoc
3. Chara
4. Cycas

Correct answer: Green sulphur bacteria

Solution

Green sulphur bacteria carry out anoxygenic photosynthesis, using compounds like hydrogen sulfide rather than water, so they do not release oxygen. The other options are oxygenic photosynthesizers and do produce oxygen.

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