Question

why are c4 plant preffered to c3 plant's

Answer 1

C4 plants are preffered then C3 plants because in higher temperatures the enzyme RuBisCO (required for carbon dioxide fixation) fixes oxygen in place of carbon dioxide, this wasteful process is known as photorespiration. C3 plants have this disadvantage that in hot dry conditions their photosynthetic efficiency suffers because of photorespiration. Whereas C4 plants like sugarcane have evolved to avoid this wasteful process of photorespiration by fixing carbon dioxide in mesophyll cells and then this fixed carbon in form of 4 carbon compounds namely malate or aspartate is shuttled to bundle sheath cells.