Auxin promotes the growth of a tendril around a support. How?
Answers
Answer:
Auxin is plant hormone which is synthesized at the tip of the shoot. It helps the cell grow longer. When a tendril comes in contact with a support, auxin stimulates faster growth of the cells on the opposite side that's why the tendril forms a coil around the support.
Explanation:
There are four key effects of auxins on plant growth and they are:
(a) Shoot elongation gets stimulated: The length of plant is dependent on the gibberlins and these get influenced by the auxins.
(b) Orientation of seedling: It was found that seedlings have a tendency to bend towards light. But the presence of auxins influence the cells in the plants. Auxins are affected by the gravity resulting in their accumulation at the bottom and we know that cells grow more where there is high concentration of auxins.
(c) Branching of root: Roots can be obtained at the cuts by applying auxin.
(d) Promoting fruit development: Presence of auxins in the flowers promotes maturation of ovary and further into a fully developed fruit.
Types of auxins:
Auxins can be either naturally occuring or obtained synthetically.
- Naturally occuring auxins: Indole acetic acid, indole ethanol, indole acetaldehyde.
- Synthetic auxins: Napthalene acetic aicd, indole butyric acid, 2,4-dichorophenoxyacetic acid.
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Explanation:
the pea plant develops tendrils which help to climb up other plants or fence or some support the movement of tendril around the support is caused by action of auxin hormone . more auxin is diffused towards the side of the tendril away from the support than the side in contact with the support. as a result, the side having more auxin grows faster than the one in contact with support. this causes the tendril to a circle around the support.