Question
Leaves in Hydrilla are long and thin. Why?

Answer

In Hydrilla, thin ribbon-like leaves are present that make it easier for the plant to move around in the water. Hydrilla is a submerged plant (Rooted plants that remain hidden under the water’s surface are known as submerged plants) with no stomata and a waxy cuticle on the leaves. The cuticle helps in preventing the plant from getting wet. Small, hollow stems enable these plants to float upright in the water and reduce water resistance. Hydrophytes either have very simple roots or none at all.

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