1--respiration takes place all the time but photosynthesis takes place only in day time. 2--respiration is the process by which food is broken down while photosynthesis is the process by which food is produced.
Photosynthesis is a process in which energy of sunlight is used by the organisms, esp. green plants, to synthesize carbohydrates from carbon dioxide and water. Respiration on the other hand is the absorption of oxygen and the release of energy and carbon dioxide. There are a lot of genuine differences when we compare both respiration and photosynthesis.
Respiration is a process by which energy is liberated. On the other hand photosynthesis is a procedure where energy\ is stored in carbohydrate molecules. Secondly oxygen is used and carbon dioxide and water are given off in the process of respiration. Whereas in photosynthesis, carbon dioxide and water are used and oxygen is given off.
A katabolic (destructive) process, resulting in the breakdown of carbohydrate molecules takes place in respiration. While in photosynthesis an anabolic (constructive) process takes place, resulting in the building up of carbohydrate molecules.
Respiration is a process which occurs at all times in all cells, independent of chlorophyll and sunlight. Photosynthesis on the other hand occurs only in cells containing chlorophyll and in the presence of sunlight. Respiration results in a loss in dry mass where photosynthesis is totally the opposite, it results in a gain in dry mass.
