1. Full of or characterized by animation, vigor, or courage: a spirited debate. 2. Having a specified mood or nature. Used in combination: high-spirited; low-spirited.
One product of photosynthesis is glucose (sugar), which provides the basis for most food chains. The second product of photosynthesis is oxygen which comes in handy if your happen to be an aerobic organism that requires oxygen for survival.
Photosynthesis, a process undergone by the chloroplasts of the cells of plants, captures the light energy radiated by the sun and utilizes it for the synthesis of glucose from carbon dioxide and water. A byproduct of this synthesis, oxygen (O2), is filtered out of these plants and into the surrounding atmosphere. Animals then inhale this oxygen and, using it and water, perform cellular respiration to extract energy from food in the form of ATP (Adenosine triphosphate).