Question

How are photosynthesis and cellular respiration related?

Answer 1

~One utilizes energy to form glucose and the other breaks it down to release [unuseable] energy.
~Cellular respiration is the process in which the chemical bonds of energy-rich molecules such as glucose are converted into energy usable for life processes. Oxidation of organic material—in a bonfire, for example—is an exothermic reaction that releases a large amount of energy rather quickly. The equation for the oxidation of glucose is:
C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy released (2830 kJ mol−1)

Photosynthesis (photo=light, synthesis=putting together), is synthesis of sugar from light, CO2 and H2O, with O2 as a waste product. Its the most important biochemical pathway known; nearly all life depends on it. It is an extremely complex process, comprised of many coordinated biochemical reactions. It occurs in higher plants, algae, some bacteria, and some protists, organisms collectively referred to as photoautotrophs. This article summarizes some of the major aspects of the process and provides links to more detailed articles explaining the numerous technical details, and implications, involved.
6 CO2 + 12 H2O + light → C6H12O6 + 6 O2 + 6 H2O