Aerenchyma cells contain large intercellular spaces and are found in aquatic plants. The functions of aerenchyma cells are:They help in the buoyancy of the floating plants.They help in respiration and also provide sufficient oxygen to the aquatic plants.The aerenchyma cells found in the leaves and stems of aquatic plants are large and longitudinal cells with air spaces filled with gas.Aerenchyma cells are found from shoots to roots and also help in the diffusion of air from leaves to roots. This helps in maintaining the proper level of oxygen for respiration.They also help in creating a locally aerobic rhizosphere in the anaerobic soil.