Question

the chemical equation for manufacture of food in green plants

Answer 1

6CO2 + 6H2O = C6H12O6 + 6O2( in the presence of sunlight and chlorophyll.

Answer 2

The chemical equation for the photosynthesis that takes place in the plants is  

$6 \mathrm{CO}_{2}+6 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{O}_{2} (presence \ of \ sunlight)$

The plants use the water and carbon dioxide got from the atmosphere in the presence of sunlight (helps in photolysis of water) to produce starch molecules.

Each molecule of glucose produced requires 6 molecules of carbon dioxide and 6 molecules of water. The oxygen produced as a by-product is used by plants for its respiration.