What chemical substances are needed for photosynthesis to take place??

Q. (a) What chemical substances are needed for photosynthesis to take place?
(b) Define photosynthesis.
(c) How can the starch test show that food has been prepared in the leaf?

Q. A student sets up an experiment on photosynthesis as follow: He takes soda water in a glass tumbler and add a chlorophyll extracts into the contents and keeps the tumbler exposed sunlight hoping that he has provided necessary ingredient for photosynthesis to proceed (viz, $C{O}_2,H_{2}O$, chlorophyll and light)
What do you think what will happen after, say few hours of exposure of light?

Q. Explain photo-chemical phase of photosynthesis. Where does it take place ?

Q. What are the different conditions for a chemical reaction to take place?

Q. In order to carry out photosynthesis, what are the substances that a plant must take in ? Also mention their sources.​