Answer: Photosynthesis is a chemical reaction that uses carbon dioxide, water and sunlight to produce glucose and oxygen while cellular respiration is a chemical reaction that uses glucose and oxygen to produce energy, carbon dioxide and water.
Explanation: Photosynthesis is a process by which green plants manufacture organic foods such as glucose and release oxygen using sunlight, carbon dioxide and water while cellular respiration is a process by which glucose is broken down in the presence of oxygen to release energy, carbon dioxide and water.
Photosynthesis occurs in plants but cellular respiration occurs both plants and animals.
Photosynthesis is an endergonic reaction because it requires energy to proceed while cellular respiration is exergonic reaction because it gives off energy.