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.
However Julius Robert Mayer (1845) came out with a view that during photosynthesis, plants capture fleeting solar energy particles and store it in the form of chemical energy in organic matter. Sachs (1864), who was a pioneer in experimental botany, demonstrated that the ultimate product of photosynthesis starch.