Hydrotropism is the process of the directional growth of plant roots towards a water source. Moist soil on one side and dry land on the other are used for the germination of seeds. The seedling first moves downward due to positive gravity. Later, it starts turning towards the wet ground.

Experiments that can prove hydrotropism

Process

1. Take 1 and 2 beakers.
2. Fill the beaker 1 with moist soil to sow the seeds.
3. In one part of beaker 2, add dry soil, and in another section, add moist soil. Sow the seeds.
4. Next, place the tiny water beaker.
5. To ensure the plants flourish, let them rest for a while.

Result

1. The plants will grow normally due to the moist soil's presence, and their roots will be straight.
2. The pant in beaker 2 will grow towards the tiny water beaker placed next to it. 

Conclusion

1. Plants exhibit hydrotropism when they move towards the porous source.
2. Hydrotropism is the directional growth of plant roots toward or away from water. 

Diagram