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 is a process used by plants, some unicellular organisms, and microorganisms. These organisms are vital to life on earth as they provide oxygen as well as food. Photosynthetic organisms take light energy and use it to make their own food.