Which gas is released into the atmosphere as a major byproduct of the light reaction of photosynthesis?
Answer and explanation
Correct answer: A. Oxygen
- Step 1: During photosynthesis, photolysis of water molecules splits H2O into hydrogen ions and oxygen gas. Step 2. The resulting oxygen gas (O2) is diffused out through the stomata into the atmosphere. Answer: Oxygen. Why not the others: Carbon dioxide is consumed as a reactant; nitrogen is an inert atmospheric gas; methane is a decomposition hydrocarbon.
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