The orientation of plant part in response to water is called hydrotropism.
Activity to demonstrate hydrotropism:
Two glass troughs A and B were taken. Both the troughs were filled with soil upto two-third level. A tiny seedling was placed in both the troughs. A small clay pot with soil was placed in trough B. In trough A water was added uniformly to the soil but in trough B water was put only in small clay pot.
Observations: After few days it was noticed that in trough A roots of the seedlings had grown straight as water is added uniformly to the soil. But in trough B roots of seedling had grown in the direction towards the clay pot because water is contained in the clay pot. This shows that roots of plant shows its growth in the direction of water.
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