Which "photosynthetic bacteria" possess both PS I and PS II

Purple sulphur bacteria.

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Cyanobacteria.

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Purple nonsulphur bacteria.

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Green sulphur bacteria.

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Solution

The correct option is B Cyanobacteria.
Photosynthetic bacteria posses only one type of photosystem and are mostly anaerobic and contains two type of pigment bacteriochlorophylls and bacterioviridin while cyanobacteria or blue-green algae posses two photosystems PS I and PS II.
So the correct option is 'Cyanobacteria'.

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