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Question

Oxygen is not produced during photosynthesis by

A
Cycas
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B
Nostoc
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C
Green sulphur bacteria
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D
Chara
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Solution

The correct option is C Green sulphur bacteria
Eukaryotic plants (Cycas, a gymnosperm and Chara, a green alga) and cyanobacteria (Nostoc) carry out oxygenic photosynthesis producing oxygen as a byproduct. They use water as the hydrogen donor.
Green sulphur bacteria carry out anoxygenic photosynthesis, which does not produce oxygen. They use hydrogen sulphide as the hydrogen donor.

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