(i) This reaction represents the process of photosynthesis.

During photosynthesis, 1 molecule of glucose (carbohydrate) and 6 molecules of oxygen are produced using the raw materials water (6 molecules) and carbon dioxide (6 molecules) in the presence of chlorophyll and light energy. Here, reduction of CO₂ occurs.

(ii) The presence of chlorophyll is necessary for photosynthesis to occur. Its most important function is to absorb energy from incoming light and transfer this absorbed energy to the reaction centres (part of photo-system)