In plant biology, hydrotropism is a plant’s growth response toward water sources. Hydrotropism, which is triggered by plant hormones, can be a positive or negative response, whereby the plant will either turn away from water concentrations, protecting itself from oversaturation or move towards them, protecting itself in times of drought.
Activity to demonstrate hydrotropism:
Take a plant (pea seedling) in a nude jar filled with sand. Now place a porous pet filled with water in the wide jar. Roots of the plant will green towards water and bond towards the water source showing hydrotropism.
Experiment to demonstrate hydrotropism: Take 2 small breakers. Label them as beaker A and beaker B. Fill beaker A with water. Then, make a cylindrical-shaped roll from a filter paper and keep it as a bridge between beakers A and B (as shown in a figure). Attach few germinating seeds in middle of filter-paper-bridge. Now, cover entire set-up with a transparent plastic container so that moisture is retained there.
It is observed that “roots of germinating seeds will grow towards beaker A.”
This experiment demonstrates hydrotropism.
