How do auxins promote the growth of a tendril around a support?

Question

Answer

Auxins are a powerful growth hormone produced naturally by plants. They are found in shoot and root tips and promote cell division, stem and root growth. They can also drastically affect plant orientation by promoting cell division to one side of the plant in response to sunlight and gravity.

Answer

Auxin helps in the development of tendril around any support. Auxins are produced in the apices or terminal end of a stem or roots. The hormone of plant Auxins helps in the growth of plants by elongating the cells of plant.

When the thread like structure called the tendril comes in touch with any kind of support, auxin begins stimulating the cells present on the alternate region to grow very fast. And due to this, the tendril coils around the support.

Answer

Auxins are growth hormones regulators produced by apical terminals of roots and stems. They are present at the tip of the tendril. The growth is slowed down when the tendrils are attached around any support because auxins are sensitive to touch and they move to the tip on the side away from the support. Due to presence of auxins on the other side, the other side grows faster than the side of tendril in contact with the support and the tendril bends towards the support.

Answer

Sample problem to on page number 92 of these book to the lakhmir Singh from class 10th Biology

Answer

How do auxins promote the growth of a tendril around a support?

Auxins are a class of plant hormones that play a crucial role in various aspects of plant growth and development, including the promotion of tendril growth. Tendrils are specialized structures found in certain climbing plants that help them attach to a support and aid in their upward growth. Auxins facilitate the growth of tendrils around a support through a series of distinct processes.

1. Initiation of Tendril Formation:
The first step in tendril growth is the initiation of tendril formation. Auxins are responsible for triggering the formation of small cells at the base of a leaf, which will eventually develop into the tendril. These cells, known as primordia, are stimulated to divide and elongate by the presence of auxins.

2. Cell Elongation and Differential Growth:
Auxins stimulate the elongation of cells in the tendril primordia. They activate specific proteins that promote the loosening of cell walls, allowing the cells to expand and elongate. This differential growth causes the tendril to curve towards the support. The side of the tendril facing the support grows more rapidly than the opposite side, resulting in the tendril coiling around the support.

3. Cell Division and Differentiation:
Auxins also play a role in cell division and differentiation within the tendril. They promote the division of cells in the growing tendril, allowing it to lengthen and increase in diameter. Additionally, auxins influence the differentiation of cells within the tendril, leading to the development of specialized tissues that aid in its attachment to the support.

4. Control of Tendril Orientation:
Auxins regulate the orientation of the tendril as it grows around the support. They cause the cells on the side of the tendril facing the support to elongate more rapidly, resulting in the tendril bending towards the support. This directional growth response ensures that the tendril wraps around the support in a helical manner, allowing the plant to cling and climb.

5. Induction of Tendril Thigmotropism:
Thigmotropism is the plant's response to mechanical stimulation, such as contact with a support. Auxins are involved in the induction of tendril thigmotropism, which allows the tendril to actively seek out and coil around a support. The presence of auxins triggers changes in gene expression and cell growth patterns, enabling the tendril to respond to the mechanical stimulus of the support and grow towards it.

In summary, auxins promote the growth of tendrils around a support by initiating tendril formation, stimulating cell elongation and differentiation, controlling tendril orientation, and inducing tendril thigmotropism. These processes ensure that the tendril effectively attaches to a support and facilitates the climbing behavior of the plant.

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