What do cyanobacteria use for energy production? What do they release as waste?

What do cyanobacteria use for energy production? What do they release as waste?

• A. Use CO2 for energy and release oxygen
• B. Use oxygen for energy and release CO2
• C. Use glucose for energy and release methane
• D. Use water for energy and release hydrogen

Answer: (A)

Cyanobacteria are photosynthetic organisms that use light energy to drive the conversion of carbon dioxide into organic molecules. In this process, water is split during the light reactions, releasing oxygen as a waste product. So they rely on CO2 as the carbon source to build energy-rich sugars, with oxygen emitted as a byproduct of photosynthesis. The energy comes from sunlight, not CO2 itself. Other options would describe respiration or improper waste products, which don’t match how cyanobacteria naturally obtain energy and dispose of byproducts.

Cyanobacteria are photosynthetic organisms that use light energy to drive the conversion of carbon dioxide into organic molecules. In this process, water is split during the light reactions, releasing oxygen as a waste product. So they rely on CO2 as the carbon source to build energy-rich sugars, with oxygen emitted as a byproduct of photosynthesis. The energy comes from sunlight, not CO2 itself. Other options would describe respiration or improper waste products, which don’t match how cyanobacteria naturally obtain energy and dispose of byproducts.