At high temperature and low concentration of carbon dioxide, C3 plants undergo photorespiration. In photorespiration, instead of carbon dioxide, atmospheric oxygen combines with RuBP (5C) to form One molecule of 3-PGA (3C) and One molecule of phospho-glycolate (2C) in the chloroplast. 3-PGA enters the Calvin cycle while Phospho- glycolate gets dephosphorylated to form glycolate (2C) which is then transported to the peroxisomes. In the peroxisomes, glycolate (2C) gets oxidised to form glyoxylate(2C) and hydrogen peroxide. Glyoxylate then gets converted to amino acid glycine (2C) which is transported to mitochondria. Thus one molecule of RUBP gives rise to one molecule of glycine.