Gaseous exchange and respiration
GASEOUS EXCHANGE IN PLANTS AND ANIMALS Necessity for Gaseous Exchange in Living Organisms • Most organisms use oxygen for respiration which is obtained from the environment. The energy comes from breakdown of food in respiration. Living organisms require energy to perform cellular activities. • Carbon (IV) oxide is a by-product of respiration and its accumulation in cells is harmful which has to be removed. Photosynthetic cells of green plants use carbon (IV) oxide as a raw material for photosynthesis and produce oxygen as a byproduct. Gaseous exchange: • The movement of these gases between the cells of organisms and the environment comprises gaseous exchange. • The process of movi...