(A) Purple sulphur bacteria are photosynthetic organisms that use light energy to synthesize organic compounds. They use inorganic compounds like $H_2

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(A) Purple sulphur bacteria are photosynthetic organisms that use light energy to synthesize organic compounds. They use inorganic compounds like $H_2S$ as electron donors instead of water. Since they use light as an energy source and inorganic compounds as electron donors,they are classified as $Photolithotrophs$.