Describe why the process of photosynthesis cannot be completed without cellular respiration?

Chemically, photosynthesis and cellular respiration are total opposites, even though both must occur for plant survival. During photosynthesis, the plant builds glucose from sunlight, water and carbon dioxide. The plant releases oxygen as a byproduct during photosynthesis. As cells tear apart glucose molecules and create ATP, they expel water and carbon dioxide as byproducts of cellular respiration. The plant recaptures some of the carbon dioxide and water expelled by the cells and recycles them for glucose production.