Question

For photosynthesis to begin, the inputs required are sunlight, water, and what?

Answer 1

carbon dioxide

Recall that the only required ingredients needed for photosynthesis are sunlight, carbon dioxide  CO 2  , and water  H 2 O . From these simple inorganic ingredients, photosynthetic organisms produce the carbohydrate glucose  C 6 H 12 O 6  , and other complex organic compounds. Essentially, these producers are changing the energy from the sunlight into a usable form of energy. They are also making the oxygen that we breathe. Oxygen is a waste product of photosynthesis.