Movement in a sensitive plant, like Mimosa pudica, is a result of rapid changes in cell turgor pressure, a type of nastic movement. When stimulated, cells at the base of its leaves lose water, causing the leaves to fold and droop. This is an involuntary, non-directional response to touch or other stimuli. In contrast, movement in human legs is voluntary and involves the coordinated action of muscles, bones, and joints, controlled by the nervous system. It’s a directional response, requiring conscious effort and neural signals from the brain and spinal cord to activate specific muscles for movement.

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Sensitive Plant Movement: A Cellular Response

The movement in sensitive plants, such as Mimosa pudica, is a unique phenomenon. It occurs through a process called thigmonasty, where the plant responds to touch or mechanical stimulation. This response is driven by changes in cell turgor pressure. When stimulated, certain cells rapidly lose water, leading to a loss of pressure that causes the leaves to fold inward and droop. This movement is an automatic, defensive mechanism to deter potential harm from animals or environmental factors.

Human Leg Movement: A Neuromuscular Action

In contrast, movement in human legs is a complex, voluntary action controlled by the nervous system. It involves a coordinated effort between the brain, spinal cord, and neuromuscular system. When we decide to move our legs, the brain sends electrical signals through motor neurons to the muscles in the legs. These signals trigger muscle contractions, which, in conjunction with bones and joints, facilitate movement.

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Cellular vs. Neuromuscular Mechanisms

The fundamental difference lies in the mechanisms driving these movements. In sensitive plants, the movement is a cellular response that doesn’t involve the plant’s nervous system, as plants lack one. Instead, it’s a direct reaction of the cells to external stimuli. In humans, leg movement is a neuromuscular response, requiring the integrated functioning of the nervous and muscular systems.

Involuntary vs. Voluntary Responses

Another key difference is the nature of the response. The folding of leaves in sensitive plants is an involuntary response that doesn’t require conscious thought. It’s a built-in reaction to specific stimuli. Human leg movement, however, is generally a voluntary action, requiring conscious thought and control. It’s directed and purposeful, allowing humans to navigate and interact with their environment.

Adaptation and Function

Both types of movements are adaptations to their respective environments. The sensitive plant’s rapid leaf movement is a defensive mechanism to protect itself. Human leg movement, on the other hand, is essential for locomotion, allowing us to walk, run, and perform various activities. It’s a crucial part of how humans interact with and adapt to their surroundings.

In short, while both sensitive plants and human legs exhibit movement, the underlying mechanisms, control systems, and purposes of these movements are fundamentally different, reflecting the diverse adaptations of plant and animal life.

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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?