Question

How does auxin affect gravitropism?

Answer 1

Gravitropism:

1. Gravitropism is a plant growth response due to the plant hormones which leads to the upward direction growth of shoots and downward direction growth of roots.
2. It occurs due to the variations in the phytohormone concentration auxin.
3. Auxin is a phytohormone responsible for cell growth and development, cell elongation, and differentiation.
4. Due to unequal distribution of auxin gravitropism occurs.
5. When more auxin is present on the base of the stem which is seen when horizontal placement of the stem is done, more growth is observed there.
6. This leads to the growth of the stem upwards against the gravitational force.
7. The growth of shoot is known as negative gravitropism (against gravity) whereas the growth of root is known as positive geotropism (due to gravity).