Which one of the following is used by purple sulphur bacteria for reduction of CO $_{2}$ to CH $_{2}$ O?

_{2}

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_{2}

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_{4}

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_{4}

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Solution

The correct option is D H $_{2}$ S
Organisms that use reduced inorganic compounds (carbon monoxide, hydrogen sulfide, ammonia etc) as the source of energy and carbon dioxide as their chief carbon source are referred to as chemoautotrophs.
The green sulfur bacteria are chemoautotrophs that use $H_{2} S$ as a source of electron and exhibit the nonoxygenic photosynthesis.
Thus, the correct answer is A.

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