How trees manufacture food for us?

In the presence of sunlight, this is what happens in a tree/plant.

Carbon Dioxide + Water -----> Carbohydrates + Oxygen

xCO2 + xH2O  ---> Cx(H2O)x  + xO2
e.g. 

Why sunlight? Because the above transformation requires energy (endothermic) which it takes from sunlight.

In other words, a tree converts light energy in sunlight into chemical energy stored in carbohydrates (sugars and starches). When we eat that fruit or nut, chemical bonds in carbohydrates are broken down by acids in our stomach releasing that energy to us.

Wow.. How beautiful!!

Let us look at it more closely..

Leaves have chlorophyll. Chlorophyll absorbs red and blue light from the sunlight so the leaves appear green. Several chlorophyll molecules are attached to a single Chloroplast where the photosynthesis occurs. In other words, chloroplast is an engine that runs on batteries called chlorophyll molecules.

Recap: Chloroplasts transform carbon dioxide and water into oxygen and carbohydrates, which have a general formula of Cx(H2O)x. The energy for this is supplied by the batteries called Chlorophyll molecules.

Thus, the energy of the light absorbed by chlorophyll is converted into chemical energy stored in carbohydrates (sugars and starches). This chemical energy drives the biochemical reactions that enable plants to grow, flower, and produce seed.

I have no idea if I made sense here..