Final answer:
Photorespiration occurs in the mitochondrion, peroxisome, and chloroplast, involving various reactions that somewhat counteract photosynthesis by using oxygen and releasing carbon dioxide.
Step-by-step explanation:
Photorespiration Reactions
Photorespiration is a process that occurs in plant cells, where the enzyme RuBisCO oxygenates RuBP, causing some of the energy produced by photosynthesis to be wasted. The reactions of photorespiration take place in several organelles within the plant cell. These include the mitochondrion, where some enzymes of the photorespiratory pathway are present, the peroxisome, which plays a key role in the conversion of glycolate to glycerate, and the chloroplast, which not only carries out photosynthesis but is also involved in the initial steps of photorespiration.
Photorespiration is considered a wasteful pathway because it counteracts the effects of photosynthesis by consuming oxygen and releasing carbon dioxide. However, this process is also seen as an evolutionary adaptation that allows plants to deal with the varying conditions affecting the availability of carbon dioxide and oxygen.
Photorespiration reactions take place in several organelles, including peroxisome and mitochondrion. While organelles like chloroplast and vacuole are involved in photosynthesis, they do not play a direct role in photorespiration.