Question

Explain with experiment:

1- hydrotropism for root

2- went experiment

3- B.jensen experiments

Answer 1

Hydrotropism is the process of growth or movement of roots towards the source of water. Here is an experiment that is performed to observe the growth of plants when water is present.

Procedure

• Take two beakers 1 and 2.
• In beaker 1 add moist soil and sow the seeds.
• In beaker 2 add dry soil in one part and moist soil in another part and sow the seeds. Also, place a small beaker of water just adjacent to it.
• Keep it for some time so that the plants can grow.

Result

• It was found that in beaker 1 due to the presence of moist soil, plants will grow normally and roots will be straight.
• In beaker 2 it was observed that the presence of water beaker next to its plant grows towards the water as shown in the above figure.

Conclusion

This experiment states that the plants move and grows towards the source of water, hence plants show hydrotropism.

Frits Warmolt Went (May 18, 1903 – May 1, 1990) was a Dutch biologist whose 1928 experiment demonstrated the existence of auxin in plants. ... He then took a position at Caltech in Pasadena, California, first researching plant hormones. His interest gradually shifted to environmental influences on plant growth.

In 1913, Boysen-Jensen modified Fritting's experiment by inserting pieces of mica to block the transport of the signal and showed that transport of auxin toward the base occurs on the dark side of the plant as opposed to the side exposed to the unidirectional light (Boysen-Jensen, 1913).