photosynthesis – chloroplasts use the energy of the sun to change water and carbon dioxide into sugar called glucose

Note: You must remember the formula:

Carbon dioxide +  Energy (light energy) + Water =  Glucose  +  Oxygen

CO₂ +  Energy (light energy) + H₂O  =  Glucose (C₆H₁₂O₆)   +  O₂

Without this formula it is going to be difficult to pass chemistry. 

To remember the meaning of photosynthesis, use the following mnemonic:

The photographer only photos this (photosynthesis) and other cows eating wet grass outside. 

Cows                     Eat           Wet        Grass        Outside

Carbon dioxide + Energy + Water = Glucose + Oxygen

CO₂                     + Energy + H₂O     = C₆H₁₂O₆ + O₂

Photosynthesis is crucial for making food and releasing oxygen. Factors like light intensity, carbon dioxide concentrations and temperature affecting its rate. 

The glucose photosynthesis creates is used in the respiration process to break down glucose (food) to release energy (ATP) powering all life functions. 

Photosynthesis provides food (glucose) for plants and organisms that eat them, as well as the oxygen we breathe. While also regulating atmospheric CO₂ levels.