The gas produced as a byproduct during photosynthesis is oxygen (O2).

Here's how it works:

* Photosynthesis: Plants use sunlight, water, and carbon dioxide (CO2) to create glucose (sugar) and oxygen.

* The Equation: 6CO2 + 6H2O + sunlight → C6H12O6 + 6O2

* Oxygen's Role: The oxygen molecules are released into the atmosphere as a waste product of the process.