Question

Design an experiment to demonstrate hydrotropism.

Answer 1

Hydrotropism is a plant's response to a stimulus or gradient in water concentration that determines the direction of growth. A plant root growing in humid air bending toward a higher relative humidity level is a common example.

Complete answer:
The root cap detects water and sends a signal to the elongating part of the root to begin the process of hydrotropism. Because the roots are not easily visible, hydrotropism is difficult to detect in underground roots, and root gravitropism is usually more important than root hydrotropism. Because water moves freely in soil and the water content of the soil is constantly changing, any gradients in the water content of the soil should be avoided.
The process of root growth or movement towards a water source is known as hydrotropism. Here's an experiment to see how plants grow when there's water in the environment.
Procedure:
Two beakers are required. 1, 2, and 3
Beaker 1 is filled with moist soil, and the seeds are planted.
Sow the seeds in beaker 2 with dry soil in one part and moist soil in the other. Place a small beaker of water next to it as well.
Keep it for a while to allow the plants to grow.
Result:
It was discovered that in Beaker 1, plants will grow normally and roots will be straight due to the presence of moist soil.
It was discovered in beaker 2 that the presence of a water beaker next to its plant causes the plant to grow towards the water, as shown in the above figure.
Conclusion
As the roots bend towards the porous pot of water, it confirms that the plant exhibits hydrotropism. Hydrotropism is a type of plant growth response in which the direction of growth is determined by a water concentration gradient stimulus.

Note:
Hydrotropism is not always the cause of greater root growth in moist soil zones than in dry soil zones. A root must bend from a drier to a wetter soil zone to achieve hydrotropism. Because roots need water to grow, roots in moist soil will grow and branch much more than roots in dry soil. Roots can't detect water inside intact pipes due to hydrotropism, so they break them to get it.