In which of the following organism oxygen does not evolve during photosynthesis?
Photosynthetic green algae
Photosynthetic blue-green algae
Photosynthetic red algae
Photosynthetic bacteria
A
Photosynthetic green algae
B
Photosynthetic blue-green algae
C
Photosynthetic bacteria
D
Photosynthetic red algae
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Solution
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Algae (red, green, brown), blue-green algae and higher plants carry on oxygenic photosynthesis, in which water serves as the source of an electron. Water splits to supply electrons and oxygen is released as a by-product.
In photosynthetic sulphur bacteria, water is not used. Hydrogen sulphide or other reduced sulphur compounds are used as a source of electrons.
Consequently, oxygen is not released but sulphur is deposited in their cells.
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