The process by which green plants take in oxygen and release CO2 in the presence of light and produce phosphoglycolate is called photorespiration. Photorespiration occurs when intense light and high temperatures occur during the Calvin cycle. In intense light and high temperature (over 300C) stomata close to conserve water. As a result, the amount of CO2 in the leaves decreases. Meanwhile, ribulose 1,5 bisphosphate reacts with O2 instead of CO2 to produce glycolate with 2-carbons. So this cycle is called glycolic acid cycle or C2 cycle. This cyclic pathway is also called the photosynthetic carbon oxidative (PCO) cycle. Glycolate enters the cell’s peroxisomes and reacts with oxygen to produce certain products. These substances enter the mitochondria and react to produce CO2. However, photorespiration does not occur because there is sufficient CO2 in the bundle sheath cells. Photorespiration can reduce the photosynthetic rate of C3 plants by up to 25%. Two amino acids glycine and serine are produced in this process. According to scientists Kazaki and Takeba (1996), photorespiration protects plants from damage to photosynthesis caused by photosynthesis at high light intensity, temperature and oxygen concentration. Sometimes photorespiration is called peroxisomal respiration.