Answer:
light and chemical
Step-by-step explanation:
Photosynthesis is the photo chemical process in which plant use sunlight, carbon-dioxide and water to produce sugar which is converted into ATP which is the fuel for the plant. In basic term it is the food producing mechanism for plan.
In this chemical reaction six molecule of water reacts with six molecules of carbon-dioxide in presence of sunlight and catalyst chlorophyll to produce one molecule of glucose and six molecule of oxygen.