Carbon dioxide (CO2) is a reactant in photosynthesis, not a product.

Here's the breakdown:

* Photosynthesis: The process by which plants and some other organisms convert light energy into chemical energy (in the form of glucose). This chemical energy is stored in the bonds of glucose molecules.

* Reactants: The substances that are used up in a chemical reaction. In photosynthesis, the reactants are:

* Carbon dioxide (CO2)

* Water (H2O)

* Light energy

* Products: The substances that are produced in a chemical reaction. In photosynthesis, the products are:

* Glucose (C6H12O6)

* Oxygen (O2)

So, the equation for photosynthesis is:

6CO2 + 6H2O + light energy → C6H12O6 + 6O2

This equation shows that carbon dioxide is used up (consumed) during photosynthesis, not produced.