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NCERT Solutions

Control and Coordination

Madhya Pradesh Board · Class 10 · Science

NCERT Solutions for Control and Coordination — Madhya Pradesh Board Class 10 Science.

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A detailed labeled diagram of a multipolar neuron, showing the cell body (soma), dendrites, axon, axon hillock, myelin sheath, Schwann cells, Nodes of Ranvier, and axon terminal with synaptic knobs.
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26 Questions Solved · 4 Sections

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Q U E S T I O N S

1What is the difference between a reflex action and walking?Show solution
A reflex action is an immediate and involuntary response to a stimulus, such as pulling a hand back from a flame. Walking is a voluntary action because it is done by deciding what to do and is under conscious control of the brain.

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2What happens at the synapse between two neurons?Show solution
At the end of the axon, the electrical impulse causes the release of some chemicals. These chemicals cross the gap called the synapse and trigger a similar electrical impulse in the dendrite of the next neuron.

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3Which part of the brain maintains posture and equilibrium of the body?Show solution
The part of the brain that maintains posture and equilibrium is the cerebellum.

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4How do we detect the smell of an *agarbatti* (incense stick)?Show solution
The smell of an agarbatti is detected by olfactory receptors located in the nose. These receptors receive the information and send it to the nervous system.

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5What is the role of the brain in reflex action?Show solution
In a reflex action, the response is controlled mainly through a reflex arc in the spinal cord. The brain is not involved in making the quick response, although the information input also reaches the brain.

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Q U E S T I O N S

1What are plant hormones?Show solution
Plant hormones are chemical compounds synthesised in one part of the plant and transported to another part to help in growth, development, and responses to the environment.

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2How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?Show solution
The leaves of the sensitive plant fold quickly in response to touch and this movement is independent of growth. In contrast, movement of a shoot towards light is a growth-related movement, so it is slow and depends on growth.

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3Give an example of a plant hormone that promotes growth.Show solution
An example of a plant hormone that promotes growth is auxin. The chapter also mentions gibberellins and cytokinins as growth-promoting hormones.

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4How do auxins promote the growth of a tendril around a support?Show solution
When a tendril touches a support, the part in contact with the object does not grow as rapidly as the part away from it. Auxin helps the cells on the side away from the support grow longer, so the tendril bends around and clings to the support.

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5Design an experiment to demonstrate hydrotropism.Show solution
To demonstrate hydrotropism, take a tray or box with moist soil on one side and dry soil on the other, or place a germinating seed so that water is available only on one side. Keep the setup undisturbed for a few days. The roots will bend and grow towards the region with more water. This shows that roots respond directionally to water, which is hydrotropism.

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Q U E S T I O N S

1How does chemical coordination take place in animals?Show solution
In animals, endocrine glands secrete hormones directly into the blood. The blood carries these hormones to specific target organs or tissues, where they produce the required response. This is the basis of chemical coordination.

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2Why is the use of iodised salt advisable?Show solution
Iodine is necessary for the thyroid gland to make thyroxin. Thyroxin helps regulate metabolism for proper growth. If iodine is deficient, a person may suffer from goitre. इसलिए iodised salt is advisable.

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3How does our body respond when adrenaline is secreted into the blood?Show solution
When adrenaline is secreted, it prepares the body for emergency action. The heart beats faster, the breathing rate increases, and blood supply to the digestive system and skin decreases so that more blood goes to the skeletal muscles.

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4Why are some patients of diabetes treated by giving injections of insulin?

E X E R C I S E S

1Which of the following is a plant hormone?
2The gap between two neurons is called a
3The brain is responsible for
4What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?
5Draw the structure of a neuron and explain its function.
6How does phototropism occur in plants?
7Which signals will get disrupted in case of a spinal cord injury?
8How does chemical coordination occur in plants?
9What is the need for a system of control and coordination in an organism?
10How are involuntary actions and reflex actions different from each other?
11Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
12What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?

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Frequently Asked Questions

What are the important topics in Control and Coordination for Madhya Pradesh Board Class 10 Science?
Key topics in Control and Coordination include Control and Coordination Overview, Control and Coordination Overview, Control and Coordination Overview. These are the concepts Madhya Pradesh Board Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in Control and Coordination — Madhya Pradesh Board Class 10 Science?
Understand the core concepts first, then work through the 87 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
Where can I get free NCERT Solutions for Control and Coordination Class 10 Science?
This page has free step-by-step NCERT Solutions for every exercise question in Control and Coordination (Madhya Pradesh Board Class 10 Science) — written the way examiners award marks: given, formula, working, answer.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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