What is the overall photosynthesis equation and the inputs and outputs?

• A. 6 CO2 + 6 H2O + light energy -> C6H12O6 + 6 O2; inputs CO2, H2O, light; outputs glucose and O2
• B. 6 CO2 + 6 H2O -> C6H12O6 + O2; no light
• C. C6H12O6 + 6 O2 -> 6 CO2 + 6 H2O; energy released
• D. 6 O2 + 6 H2O -> CH4 + CO2; sunlight not required

Answer: (A)

Photosynthesis uses light energy to convert carbon dioxide and water into a stored chemical form (glucose) plus oxygen. The overall equation shows the reactants on the left and the products on the right, with light energy required as part of the process.

The statement that includes 6 CO2 + 6 H2O + light energy -> C6H12O6 + 6 O2 is the best because it shows the correct reactants (carbon dioxide, water, and light) and the correct products (glucose and oxygen), and the equation is balanced.

The other options don’t fit. Without light, photosynthesis can’t occur, so a version missing light energy isn’t the proper overall equation. The reverse process, glucose plus oxygen yielding carbon dioxide and water with energy released, is respiration, not photosynthesis. The final option describes a different, non-photosynthetic reaction (producing methane from water and oxygen), which isn’t how plants convert light energy into chemical energy.