How do aquatic plants stay afloat?

Some water plants are kept afloat thanks to the air that is contained in their tissues and makes stems and leaves floating. Other plants, such as water lilies, have flat, rounded leaves that hold on the surface of the water as a boat. There are also waxy, "waterproof" leaves, as well as leaves with curved upwards edges. The leaves of other plants are covered simultaneously with hairs and wax. The leaf is so small and light that the surface tension of the water is enough to keep it afloat. The basis of the leaves of the water hyacinth is filled with air as a float.

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