Answer: Option C) Carbon dioxide
Explanation:
During photosynthesis, atmospheric carbon dioxide and water is reacted to give sugar molecules in the presence of sunlight trapped by the green coloured pigment named chlorophyll present in the chloroplast. At the end oxygen is given off as by-product
The equation is shown below:
6CO2 + 6H2O ---> C6H12O6 + 6O2
Thus, carbon dioxide is a reactant alongside water
