Discussion
Chemosynthesis involves CO2 fixation using energy derived from
Answer: D
Chemosynthesis fixes carbon dioxide using energy released by oxidising reduced inorganic compounds such as hydrogen sulphide, ammonia, iron(II) and sulphur, which is what the keyed option 'inorganic and organic compounds' points to. The energy comes from chemical reactions, not from light.
Sunlight is the energy source of photosynthesis, so option A is wrong. Infrared and ultraviolet radiation are not used by chemosynthetic bacteria as an energy source either, so options B and C are wrong.
Typical chemosynthetic organisms are the sulphur, iron and nitrifying bacteria. They live in places without light, such as deep sea vents, and form the base of the food chain there.
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