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Question

Which one of the following categories of organisms do not evolve oxygen during photosynthesis?

A
Red algae
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B
Photosynthetic bacteria
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C
C4 plants with kranz anatomy
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D
Blue green algae
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Solution

The correct option is C Photosynthetic bacteria
The photosynthetic bacteria e.g., purple non-sulphur bacteria, use bacteria chlorophyll a and b in anaerobic environments for photosynthesis. The reducing agent involved is hydrogen rather than water, so oxygen is not produced.

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