Q.
During the process of aerobic respiration, (i) gets oxidised and its electrons get transferred to the electron transport chain while in photosynthesis, (ii) gets oxidised to transfer molecules to the electron transport chain.
The oxidative breakdown of respiratory substrates with the help of atmospheric O2 is known as aerobic respiration. It involves complete breakdown of substrates into CO2 and water, releasing energy. For example, the simple chemical equation for aerobic breakdown of glucose is C6H12O6+6O2→6CO2+6H2O+2870kJ/686KCal
While during photosynthesis chlorophyll a gets oxidised to transfer molecules to the electron transport chain.