Answer is A). Auto-heterotrophic bacteria
The sun is the primary source of energy for all life. Plants, algae and some bacteria utilize the light energy from the sun during photosynthesis. Photosynthesis is the physico- chemical process by which plants use this light energy to synthesize (or produce) organic compounds. There are two types of photosynthesis: oxygenic photosynthesis and anoxygenic photosynthesis.
Oxygenic photosynthesis is the process used by plants, algae aknd some photosynthetic bacteria. During this process carbon dioxide is reduced to a carbohydrate and electrons are removed from water, releasing oxygen into the air.
Anoxygenic photosynthesis is performed by specialized bacteria. During this process the light energy is used to remove electrons from other sources, not water. These sources include hydrogen gas, hydrogen sulphide and iron compounds. Therefore, instead of releasing oxygen, other compounds such as sulphur are released during this process.
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