Aerenchyma is a special tissue found in hydrophytes (e.g. Hydrilla, Potamogeton, etc.) and some land plants (e.g. petiole of banana, Canna), formed by parenchyma cells. They make a network by leaving wide air spaces (air cavities) for the gaseous exchange and make the aquatic plants light and buoyant, so that they can easily float.
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[D] Buoyancy to hydrophytic plants