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a
purple sulphur bacteria
b
purple non-sulphur bacteria
c
green sulphur bacteria
d
green non-sulphur bacteria
answer is B.
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Detailed Solution
Rhodospirillum is photoheterotrophic bacteria. Photoheterotrophs obtain carbon from external organic source and energy from sunlight. Theyare pigmented and perform photosynthesis. These are purple green non-sulphur bacteria.