Which term describes an organism that uses light for energy and CO2 as carbon source?

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Energy from light classifies an organism as a phototroph, while using CO2 as the carbon source marks it as an autotroph. Combining those ideas, an organism that uses light for energy and CO2 as its carbon source is a photoautotroph. This group includes plants, algae, and cyanobacteria, which perform photosynthesis to capture light energy and convert CO2 into organic matter. If it used light for energy but relied on organic carbon, it would be a photoheterotroph. If it used chemical energy from inorganic compounds, it would be a chemoautotroph, and if it used chemical energy with organic carbon, it would be a chemoheterotroph.