How do plants access the energy stored in glucose

Please explain, I just started Biology 20 (Grade 11), and I can't find this in my textbook....

thanks

The catabolic process of respiration transfers the energy stored in food molecules to ATP. If the energy of sugar molecules was released at one time the body could not use it efficiently. Organisms use ATP molecules to capture and release small amounts of energy to fuel various bodily functions. ATP is unique in its function as an energy transferrer. The molecule contains the nitrogenous base adenine connected to three molecules of phosphorous. The bonds between the last 2 phosphates are high energy bonds. When ATP releases the terminal (end) phosphate, energy is released while forming a new compound ADP. ADP can be refitted with another phosphate (phosphorylation) to form ATP again. Cellular respiration contains the steps to allow this process to occur.
In order for the most efficient production of ATP to occur the cell must transfer this energy from the chemical bonds of the organic compounds to the ATP molecule with minimal loss. The process involved is found in basic inorganic chemistry, the REDOX reactions. Redox is short for oxidation-reduction which involves partial or complete transfer of electrons from one reactant to another.

Aerobic cellular respiration, same as you