<P> Aerenchyma is a spongy tissue that forms spaces or air channels in the leaves , stems and roots of some plants , which allows exchange of gases between the shoot and the root . The channels of air - filled cavities ( see image to right ) provide a low - resistance internal pathway for the exchange of gases such as oxygen and ethylene between the plant above the water and the submerged tissues . Aerenchyma is also widespread in aquatic and wetland plants which must grow in hypoxic soils . </P>
aerenchyma is present in which category of plants
aquatic and wetland plants which must grow in hypoxic soils