This document defines photosynthesis as the process by which light energy is converted into chemical energy in the form of sugar. The chemical reaction is given as 6CO2 + 6H2O + light energy yields C6H12O6 + 6O2. Respiration is defined as the process by which organisms break down sugar to release energy, with the chemical reaction given as C6H12O6 + 6O2 yields 6H2O + 6CO2 + energy. Reactants are defined as the starting substances in a chemical reaction, while products are defined as the substances formed by the reaction of reactants. The document also defines and provides examples of guard cells, stomata, the palisades layer, sp