Photoautotrophs use
A) light as an energy source and methane as a carbon source.
B) light as an energy source and CO₂ as a carbon source.
C) H2S as an energy source and CO₂ as a carbon source.
D) CO₂ as both an energy source and a carbon source.

Question

Quizplus · Accepted Answer

Photoautotrophs use light as an energy source and CO₂ as a carbon source in the process of photosynthesis. This is the most efficient way for them to produce organic compounds for their survival and growth. Using methane or H2S as energy sources is not as common among photoautotrophs as using light, and CO₂ cannot be used as an energy source, only as a carbon source.

Photoautotrophs Use