What is the role of sulfur in the sulfur cycle? decomposition reduction oxidation Reduction of CO_2 to generate carbohydrates can occur when coupled to the oxidation reduced s compounds (for example, has). This latter process is carried out by what type of ? Solution 10. Oxidation- is the role of sulfur chemoautotrophs in the sulfur cycle chemoautotrophs anrganism that derives its energy from chemical processes rather than photosynthesis 11. Reduction of co2 to generate carbohydrates can occur when coupled to the oxidation of reduced sulphur compounds. the latter type of process is carried out by Sulphate reducers.