Which of the following oxidizes inorganic substances to obtain energy that is used, in part, to fix CO₂?
A) photoautotrophs
B) photoheterotrophs
C) chemoautotrophs
D) chemoheterotrophs that perform decomposition

Question

Quizplus · Accepted Answer

Chemoautotrophs obtain energy from the oxidation of inorganic substances such as hydrogen sulfide, ammonia, and hydrogen gas, and use this energy to fix carbon dioxide into organic compounds. Photoautotrophs obtain energy from sunlight and also fix carbon dioxide into organic compounds but do not oxidize inorganic substances for energy. Photoheterotrophs obtain energy from sunlight but require organic compounds as a carbon source, while chemoheterotrophs that perform decomposition obtain energy from the oxidation of organic compounds and also require organic compounds as a carbon source.

Which of the Following Oxidizes Inorganic Substances to Obtain Energy