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Difference Between Photosynthesis and Respiration

Difference between Photosynthesis and Respiration:

There is a noticable Difference between Photosynthesis and Respiration.Photosynthesis occurs during day time, whereas respiration occurs both at day and night. The leaves (and other actively metabolizing tissues) respire during night. They utilize oxygen and release CO2. There is low intensity of light at dawn and dusk. Thus the rate of photosynthesis and the rate of respiration become equal during that short period of time. So the amount of oxygen released from photosynthesis is equal to the amount used by cellular respiration.

Similarly, the amount of carbon dioxide released by respiration is used by the photosynthesizing cells. “So there is no net gas exchange between leaves and atmosphere at this moment. This is called compensation point.” The rate of photosynthesis increases with the increase of intensity of light. So, more CO2 is required. This CO2 can only be supplied by respiration.

Similarly, photosynthesis produces more oxygen than the need of the respiring cells. So there is net release of oxygen and uptake of carbon dioxide.


Photosynthesis is the photochemical process in the green plants synthesize food or sugar by using sunlight in the presence of carbon dioxide, water and chlorophyll present in the green parts of the plants. Light energy is changed to the biochemical energy of sugar and other organic compound and oxygen are released during this process.


Respiration is the process by which the living organisms or cells break down energy-rich organic compounds like glucose using oxygen to get energies for the various activities of the cells. In this process, glucose is broken down and carbon dioxide is produced.

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