NCERT Solutions for Class 10 Science Chapter 6 Control and Coordination PDF Download

NCERT Solutions for Class 10 Science Biology Chapter Control and Coordination: In this article, we have provided the NCERT Solutions for Class 10 Science Chapter 6 Control and Coordination. These solutions help students get all the answers in one place. We also provide a free PDF for these solutions. These solutions can help students prepare effectively for the exam.

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NCERT Solutions for Control and Coordination of Class 10 Science Biology Chapter

Intext Solutions Page Number: 105

1. What is the difference between a reflex action and walking?

A reflex action is an automatic, involuntary response to a stimulus (e.g. pulling your hand away from something hot) that does not require conscious thought. Walking, on the other hand, is a voluntary, coordinated movement that requires conscious control and decision-making by the brain.

2. What happens at the synapse between two neurons?

The small space between two nerve cells is called a synapse. At the synapse, a chemical substance is produced at the end of the axon of a nerve cell and reaches the other nerve cell via the dendrite. Information is transmitted from one nerve cell to another via synapses.

3. Which part of the brain ensures the body’s posture and balance?

The cerebellum is the part of the brain that maintains the body’s posture and balance.

4. How do we recognize the smell of an agarbatti (incense stick)?

We perceive the smell of an agarbatti (incense stick) via olfactory receptors in the nose. These receptors send signals to the olfactory bulb in the brain, which processes and identifies smell.

5. What role does the brain play in reflex action?

The brain plays no role in the reflex effect. These involuntary actions are controlled by the spinal cord and occur immediately, without thinking about how to respond to the stimuli.

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Intext Solutions Page Number: 108

1. What are plant hormones?

Plant hormones are also called phytohormones. Plant hormones are chemical substances that help control the growth, flowering, height, development of plants and their response to the environment.

2. How does the movement of the leaves of the sensitive plant differ from the movement of a shoot towards light?

3. Give an example of a plant hormone that promotes growth.

Auxin

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

When the tip of a tendril touches a support, the auxins present in its tip move to the side of the tip facing away from the support. Auxins promote growth. So because it contains more auxins, the side of the vine away from the support grows faster (and becomes longer) than the side in contact with the support, causing the vine to twist (or bend) around the support ).

5. Design an experiment to demonstrate hydrotropism

Goal: Detect hydrotropism in plant roots.

Materials needed: A clear pot or cup, two paper towels, a small plant or seeds (e.g. bean seeds), water, soil

Procedure:

• Fill a clear pot or cup with soil.
• Plant a small plant or seed in the center of the pot.
• Place a damp paper towel near the roots on one side of the pot and a dry paper towel on the other side.
• Water the plant sparingly, only from the side with a damp paper towel.
• Leave the setup for a few days.
• Observation: The roots grow toward the wet paper towel and exhibit hydrotropism as they respond to moisture.

Conclusion: This experiment shows that plant roots exhibit hydrotropism and grow towards the water source.

Intext Solutions Page Number: 111

1. How does chemical coordination occur in animals?

In animals, chemical coordination occurs through the hormones secreted by the endocrine glands. In animals, coordination occurs through both the hormonal system and the nervous system, which is called the endocrine system. Endocrine glands secrete animal hormones directly into the blood, which reach specific cells. There are special types of molecules on the surface of cells that recognize these hormones. These cells act according to the information carried by a particular hormone.

2. Why is it advisable to use iodized salt?

It is recommended to use iodized salt because the thyroid needs iodine to produce the hormone thyroxine. The hormone thyroxine controls all the metabolic activities of our body like metabolism of carbohydrates, fats, proteins etc. Due to the deficiency of thyroxine, a disease called goiter is caused.

3. How does our body react when adrenaline is released into the blood?

The heartbeat speeds up as adrenaline is released into the blood, providing our muscles with more oxygen. The blood supply to the digestive system and skin decreases because the small arteries around the muscles of these organs contract. This directs the direction of blood towards our skeletal muscles. The contractions of the diaphragm and rib muscles also increase the breathing rate. All of these reactions allow us to face situations of fear and anger.

4. Why are some patients with diabetes treated with insulin injections?

The hormone insulin regulates blood sugar levels. If this is not excreted in sufficient quantities, the sugar level in the blood rises. This has many harmful effects. To treat the harmful effects of elevated blood sugar levels, diabetics are treated with insulin injections.

Back exercises page number: 112

1: Which of the following is a plant hormone?

(a) Insulin

(b) Thyroxine

(c) Estrogen

(d) Cytokinin

Solution: (d)Cytokinin is a plant hormone.

2: The gap between two neurons is called a

(a) Dendrite

(b) Synapse

(c) Axon

(d) Impulse

Solution: (b) The gap between two neurons is called a synapse

3: The brain is responsible for this

(a) Thinking

(b) Regulation of heartbeat

(c) Bring the body into balance

(d) all of the above

Solution: (d) The brain is responsible for thinking, regulating the heart and balancing the body.

4: What function do receptors have in our body? Think about situations in which receptors do not function properly. What problems are likely to arise?

Receptors are sensory structures present throughout the body.

Functions of receptors:

• They perceive external stimuli such as heat or pain.
• They also trigger an impulse in the sensory neuron that sends a message to the spinal cord.
• When the receptors are damaged, the external stimuli that transmit signals to the brain cannot be felt.

For example, if we accidentally touch a hot object with damaged receptors, we can burn our hands because damaged receptors cannot perceive the external stimuli of heat and pain.

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CHECK: NCERT Solutions for Class 10 Science Chapter 6 – Control and Coordination

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