| Term | Definition |
| Energy | Ability to do work |
| Thermodynamics | Study of flow and transformation of energy |
| First Law of Thermodynamics | Energy cannot be created or destroyed; it can only be converted from one form to another |
| Metabolism | The sum of all the chemical reactions in your body |
| Photosynthesis | Process where plants convert solar energy into glucose |
| Chloroplasts | Organelle that enables plants to photosynthesize, containing chlorophyll |
| Reactants | Starting substances in a chemical reaction |
| Products | Ending substances in a chemical reaction |
| Chlorophyll | Green pigment that absorbs light |
| ATP | Portable form of energy, delivers energy where needed in the cell |
| Pigments | Light absorbing colored molecules, located in chloroplasts |