Answer/Explanation:
When cell absorbs light energy it begins photosynthesis (process by which sunlight is transformed into food for the plant). The light energy is absorbed by the chloroplast. Photosynthesis happens and oxygen, water, and glucose are produced. These are transported to the mitochondria where ATP (chemical energy) is released. All that is left is Carbon dioxide and water which are moved back to the chloroplast. This process between the mitochondrion and the chloroplast is cellular respiration.
so when water is broken down to from oxygen during phostosythesis the cellular respiration oxygen is combined eith hydrogen to from water while phostosythesis requires carbin dioxide and release oxygen so that cellular respiration requires oxygen to release cardon dioxide without oxygen and ATP be produced
hopefully i made it easier for you if not i am sorry i tried
