Dear student,
The process by which plant converts the radiant energy into chemical energy in the presence of sunlight through the chlorophyll molecules present in the chloroplast of the leaves. chlorophyll molecule fixes the atmospheric carbon (CO2) with the photolysis of water and liberation of oxygen.
The equation for photosynthesis is -
nCO2 + nH2O (CH2O)n + nH2O + nO2
Regards.