Answer:
CO2 and H2O are the reactants in the given reaction
Step-by-step explanation:
The reaction that is written in the question is the general equation of photosynthesis.
In this reaction the carbon di oxide reacts with water to form glucose ,oxygen and water.The overall reaction is given below
6CO2+12H2O= C6H12O6+6O2+6H2O
carbon di oxide(CO2) and water(H2O) act as reactant in the above reaction.