This is perhaps the most vital adaptation. These are large, air-filled spaces in the stems and roots that allow oxygen to reach the submerged parts of the plant. They also provide buoyancy, helping the plant stay afloat.

Submerged plants often have thin, dissected leaves to minimize resistance from water currents, while their stems are flexible to prevent breaking under pressure. Classification by Habitat

These live entirely underwater. Hydrilla is a common example, performing photosynthesis in the dim light beneath the surface.

The primary challenge for an aquatic plant is the lack of oxygen and the physical force of moving water. To overcome this, hydrophytes have developed unique anatomical features:

These are rooted in water-logged soil, but most of their body grows above the water line. Cattails and Reeds are classic examples found in marshes. Ecological Importance