Question

With the help of an experiment, prove that roots are more positively hydrotropic than geotropic.

Answer 1

Aim:

To prove that roots are more positively hydrotropic than geotropic.

Apparatus:

Wire netting or gauze, wires, moist sawdust, germinating bean seeds

Procedure:

Take a piece of wire netting or gauze and suspend it with the help of wires.

Place moist sawdust of about 1 inch on the wire netting.

Embed some germinating bean seeds in the sawdust.

Observation:

As the seeds germinate, the radicles initially grow downwards through the wire netting under the influence of gravity. However, after some time they start growing upwards towards the moist sawdust. The shoots grow upwards all the time.

Inference:

Roots grow in the direction of gravity and water. The growth of roots towards water and overcoming the force of gravity suggests that roots are positively hydrotropic than geotropic. This implies that water is a more effective stimulus than gravity.