[Campbell Biology P.641] Photoautotrophs obtain their energy and carbon from which of the fo... | Practice Question

Photoautotrophs obtain their energy and carbon from which of the following sources?

  • A: Light as an energy source and CO2 as a carbon source.
  • B: Light as an energy source and methane as a carbon source.
  • C: N2 as an energy source and CO2 as a carbon source.
  • D: CO2 as both an energy source and a carbon source.

Explanation

Photoautotrophs, such as plants, algae, and cyanobacteria, use light energy to synthesize organic compounds from carbon dioxide CO2 through photosynthesis. Thus, light is their energy source, and CO2 is their carbon source.