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 will help the students to get all the answers in one place. We will also be providing a free PDF for these solutions. These solutions can help the students to prepare effectively for the exam.
Keep reading the article to get all the solutions.
NCERT Solutions For Class 10 Science Biology Chapter Control And Coordination
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 (like pulling your hand away from something hot) that does not require conscious thought. Walking, on the other hand, is a voluntary, coordinated movement that involves 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 one nerve cell that reaches the other nerve cell through the dendrite. Thus, information is transmitted from one nerve cell to another nerve cell by synapse.
3. Which part of the brain maintains posture and equilibrium of the body?
The cerebellum is the part of the brain that maintains the posture and equilibrium of the body.
4. How do we detect the smell of an agarbatti (incense stick)?
We detect the smell of an agarbatti (incense stick) through olfactory receptors in the nose. These receptors send signals to the olfactory bulb in the brain, which processes and identifies the scent.
5. What is the role of the brain in reflex action?
There is no role of the brain in reflex action. These involuntary actions are controlled by the spinal cord and take place immediately without thinking of 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 the chemical substances which help in controlling growth, flowering, height, development of plants and their response to the environment.
2. How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
| Movement of Leaves of Sensitive Plant | Movement of a Shoot Towards Light |
| Rapid, immediate response to touch | Slow, directional growth towards light (phototropism) |
| Non-directional movement | Directional movement towards the light source |
| Does not involve growth | Involves growth |
| Caused by changes in turgor pressure | Caused by unequal cell elongation due to light |
| Independent of light direction | Dependent on light direction |
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, then the auxins present in its tip move to that side of the tip which is away from the support. Auxins promote growth. So, due to more auxins in it, the side of the tendril away from the support grows faster (and becomes longer) than the side which is in contact with the support and makes the tendril twirl (or bend) around the support.
5. Design an experiment to demonstrate hydrotropism
Aim: To demonstrate hydrotropism in plant roots.
Materials Needed: A transparent pot or beaker, Two paper towels, A small plant or seeds (e.g., bean seeds), Water, Soil
Procedure:
- Fill a transparent pot or beaker with soil.
- Plant a small plant or seeds in the centre of the pot.
- On one side of the pot, place a wet paper towel near the roots, and on the other side, place a dry paper towel.
- Water the plant sparingly, only on the side with a wet paper towel.
- Leave the setup for a few days.
- Observation: The roots will grow towards the wet paper towel, demonstrating hydrotropism as they respond to moisture.
Conclusion: This experiment shows that plant roots exhibit hydrotropism, growing towards the source of water.
Intext Solutions Page Number- 111
1. How does chemical coordination take place in animals?
Chemical coordination in animals takes place through the hormones secreted by the endocrine glands. Coordination in animals takes place through the hormone system as well as the nervous system which is called the endocrine system. Endocrine glands secrete animal hormones directly into the blood that reach specific cells. Special types of molecules are present on the surface of cells to detect these hormones. These cells act according to the information that a particular hormone carries.
2. Why is the use of iodised salt advisable?
It is advised to use iodised salt because the thyroid gland needs iodine to produce thyroxin hormone. The Thyroxin hormone controls all the metabolic activities of our body like the metabolism of carbohydrates, fats proteins etc. Due to the deficiency of thyroxin a disease called goitre is caused.
3. How does our body respond when adrenaline is secreted into the blood?
The heartbeat increases when adrenaline is secreted into the blood so that more oxygen is supplied to our muscles. The blood supply to the digestive system and skin decreases because the small arteries around the muscles of these organs contract. This turns the direction of blood towards our skeletal muscles. The breathing rate also increases due to the contractions of the diaphragm and rib muscles. All these responses enable us to face the situations of fear and anger.
4. Why are some patients with diabetes treated by giving injections of insulin?
Insulin hormone regulates blood sugar levels. If this is not secreted in proper amounts, the sugar level in the blood rises. This causes many harmful effects. To treat the harmful effects of increased levels of blood sugar, diabetic patients are treated with injections of insulin.
Back Exercises Page Number- 112
1: Which of the following is a plant hormone?
(a) Insulin
(b) Thyroxin
(c) Oestrogen
(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
(a) Thinking
(b) Regulating the heartbeat
(c) Balancing the body
(d) all of the above
Solution: (d)The brain is responsible for thinking, regulating the heart and balancing the body.
4: What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?
Receptors are sensory structures present in the whole body.
Functions of receptors:
- They sense external stimuli such as heat or pain.
- They also trigger an impulse in the sensory neuron which sends a message to the spinal cord.
- When the receptors are damaged, the external stimuli transferring signals to the brain are not felt.
For example in the case of damaged receptors, if we accidentally touch any hot object, then our hands might get burnt as damaged receptors cannot perceive the external stimuli of heat and pain.
To get the complete solutions for the NCERT Class 10 Science Chapter- Control and Coordination, click on the link below:
CHECK: NCERT Solutions for Class 10 Science Chapter 6-Control and Coordination
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