http://www.youtube.com/watch?v=YeD9id mcX0w Biology Used by plants to generate energy Use energy from sun to make sugar (glucose) Begins at the leaf within the chloroplast Chlorophyll is the molecule in the chloroplast Radiant energy (sunlight) + 6 molecules of carbon dioxide + 6 molecules of water Water enters plant through roots and travels to leaves Carbon dioxide and sun enter into leaf. 1 molecule of sugar (glucose) + 6 molecules of oxygen + 6 molecules of water Glucose leaves the leaf and provides energy for the plant. Light-dependent reactions require sunlight and happen in the thylakoid Light-dependent reaction makes ATP and oxygen. Light-independent reactions do NOT require sunlight and happen in the stroma. ATP with carbon dioxide is used to create glucose. Universal fuel for all cells Transports needed substances across membranes Activates metabolic reactions that would not occur automatically Performs specific mechanical work, like moving muscles. Glucose provides energy for the plant and for animals that eat the plants.