Auxins promote the growth of a tendril around a support through differential growth. When a tendril comes into contact with a support, auxin concentration increases on the side opposite the support. This higher concentration of auxins causes the cells on that side to elongate more than those on the side in contact with the support, leading the tendril to curl around the object.

Let’s discuss in detail

Initial Contact and Auxin Response

When a tendril of a climbing plant, such as a pea plant, comes into contact with a support, it triggers a growth response mediated by auxins. Auxins are plant hormones that play a crucial role in cell elongation and growth direction. The physical contact initiates a redistribution of auxin within the tendril.

Redistribution of Auxin

Upon contact, auxin is redistributed to the side of the tendril opposite the support. This uneven distribution of auxin is a key factor in how tendrils curl around supports. The higher concentration of auxin on the far side of the tendril leads to a faster growth rate in those cells compared to the cells in contact with the support.

Differential Growth Leading to Coiling

The increased concentration of auxin on the side away from the support causes those cells to elongate more than the cells on the side in contact with the support. This differential growth causes the tendril to bend towards the support. As the cells on the opposite side continue to grow faster, the tendril begins to coil around the support, securing the plant.

Mechanism of Support and Stability

This coiling mechanism is crucial for the support and stability of climbing plants. By wrapping around a support, the tendrils provide an anchor for the plant, allowing it to grow upwards and gain access to more sunlight, which is vital for photosynthesis. This ability to climb also enables the plant to compete effectively in dense vegetation where direct access to sunlight is limited.

Adaptive Significance of Tendril Coiling

The ability of tendrils to coil around supports is an excellent example of plant adaptation to their environment. This mechanism allows climbing plants to grow in environments where they might not otherwise be able to compete. By using structures like walls, trees, or other plants for support, they can grow towards light without investing energy in developing thick, supportive stems.

In summary, auxins play a pivotal role in the growth of tendrils around supports, primarily through the mechanism of differential growth. This process exemplifies the remarkable adaptability of plants and their ability to interact with and respond to their physical environment, ensuring survival and growth in diverse conditions.

Discuss this question in detail or visit to Class 10 Science Chapter 6 for all questions.
List of Questions of Class 10 Science Chapter 6

What is the difference between a reflex action and walking?
What happens at the synapse between two neurons?
Which part of the brain maintains posture and equilibrium of the body?
How do we detect the smell of an Agarbatti (Incense Stick)?
What is the role of the brain in reflex action?
What are plant hormones?
How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
Give an example of a plant hormone that promotes growth.
How do auxins promote the growth of a tendril around a support?
Design an experiment to demonstrate hydrotropism.
How does chemical coordination take place in animals?
Why is the use of iodised salt advisable?
How does our body respond when adrenaline is secreted into the blood?
Why are some patients of diabetes treated by giving injections of insulin?
What is the function of receptors in our body?
Draw the structure of a neuron and explain its function.
How does phototropism occur in plants?
Which signals will get disrupted in case of a spinal cord injury?
How does chemical coordination occur in plants?
What is the need for a system of control and coordination in an organism?
How are involuntary actions and reflex actions different from each other?
Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?