Auxin is a prime example of a plant hormone that promotes growth. It plays a pivotal role in the elongation of plant cells, thereby facilitating growth. Auxins are particularly influential in the growth of stems and roots, and they also play a crucial role in processes like phototropism (growth towards light) and gravitropism (growth in response to gravity).

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Auxin: The Primary Growth Promoter

Auxin is a key plant hormone known for its central role in promoting growth. It is one of the first plant hormones to be discovered and has been extensively studied for its effects on plant development. Auxins are primarily produced in the shoot tips and young leaves of plants and are integral to various growth processes.

Cell Elongation and Stem Growth

One of the primary functions of auxin is to stimulate cell elongation, which is crucial for the growth of plant stems. Auxin achieves this by softening the cell walls, allowing them to expand. When auxin is distributed evenly in a plant, it promotes uniform growth. However, its distribution often varies, leading to differential growth rates in different parts of the plant.

Root Development and Growth

Auxin also plays a significant role in root formation and growth. It helps in the initiation of root cells and their subsequent development into full-fledged roots. This hormone is particularly important in the formation of lateral roots, which branch out from the main root, helping in increased water and nutrient absorption.

Involvement in Phototropism and Gravitropism

Auxin is instrumental in phototropism, where plants grow towards light. In this process, auxin accumulates on the shaded side of the plant, causing those cells to elongate more and bend towards the light. Similarly, in gravitropism, auxin distribution helps roots grow downwards (positive gravitropism) and stems grow upwards (negative gravitropism), aligning the plant with gravitational forces.

Auxin in Agricultural Practices

In agriculture, synthetic auxins are used to regulate plant growth and development. They are applied to promote rooting in cuttings, to control fruit drop, and even as herbicides. The versatility of auxin in promoting plant growth and its applications in agriculture underscore its importance as a plant hormone.

In conclusion, auxin is a fundamental plant hormone that significantly influences plant growth and development. Its roles in cell elongation, root and stem growth, and response to environmental stimuli like light and gravity, make it a critical component in the life cycle of plants. The understanding and manipulation of auxin have also led to advancements in agricultural practices, highlighting its importance beyond natural plant growth.

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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?