Take two small beakers and label them as $A$ and $B$. Fill beaker $A$ with water. Now make a cylindrical-shaped roll from a filter paper and keep it as a bridge between beaker $A$ and beaker $B$, as shown in the figure. Attach few germinating seeds in the middle of the filter paper bridge. Now, cover the entire set-up with a transparent plastic container so that the moisture is retained.

Observation :

The roots of the germinating seeds will grow towards beaker $A$.

This experiment demonstrates the phenomenon of hydrotropism.