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NCERT Solutions for Class 10 Science Chapter 6 Control and Coordination helps students to understand how coordination works in animals and plants and how hormones are involved. Reading the answers to this chapter makes it easy for students to prepare for exam and also gives them confidence. The answers are given in a step-by-step way and also include diagrams, flowcharts and simple examples so that it becomes easy to understand. So this chapter becomes easy to revise with the help of the NCERT solutions.
NCERT Solutions for Class 10 Science Chapter 6 are made in easy and simple language so students can understand them without any confusion. All textbook questions are solved properly, which helps in revision and exam time. It also helps students to know how coordination happens in living things and why it is needed. These solutions are helpful for practice and also for last time study. So, students can use the NCERT Solutions for Class 10 without any problem.
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Students can download the PDF for detailed questions and answers from here:
So, basically, in this section, we will see the NCERT Exercise Questions. These questions are one of the most important parts of understanding the topics.
Topic 6.1 - Animals Nervous System: Page number 105
Q.1. What is the difference between a reflex action and walking?
Answer:
The difference between a reflex action and walking-
REFLEX ACTION
| WALKING
|
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Q.2 . What happens at the synapse between two neurons?
Answer:
The synapse is the small space between the two nerve cells. At the synapse, a chemical substance is produced at the end of the axon of one of the neurons that reach the other neurons with the help of dendrite. Therefore, the information signal is transmitted from one neuron to other neurons by a synapse.
Q.3. Which part of the brain maintains posture and equilibrium of the body?
Answer:
The cerebellum controls and maintains the posture and equilibrium of the body.
Q.4. How do we detect the smell of an agarbatti (incense stick)?
Answer:
The smell of agarbatti (incense stick) mixed in the air. It is detected by the olfactory receptor of the nose. The sensory nerves of the forebrain send this information to the olfactory lobe and respond to the information signal.
Q.5. What is the role of the brain in reflex action?
Answer:
There is no role of the brain in a reflex action. These involuntary actions are controlled by the spinal cord, which reacts immediately without thinking of how to respond to a stimulus.
Topic 6.2 - Coordination in plants: Page number 108
Answer:
Plant hormones - These are also called phytohormones. Plant hormones are the chemical substance which helps in the growth of the plant(height), flowering and also the development of plants and their response to the environment.
For example; auxins, gibberellins and cytokinins are some phytohormones.
Answer:
Here is the difference:
Movement of leaves of sensitive plants | Movement of the shoot towards light |
1. It does not depend on the direction of the stimulus applied. | 1. It depends on the direction of the stimulus applied. |
2. The stimulus is touch. | 2. The stimulus is light |
3. It is due to the sudden loss of water from the swelling at the base of the leaves. | 3. It is caused by the uneven growth on two sides of the shoot. |
4. It is not a growth movement. | 4. It is a growth movement. |
Q.3. Give an example of a plant hormone that promotes growth
Answer:
Auxins are phytohormones that promote growth in plants.
Q.4. How do auxins promote the growth of a tendril around support?
Answer:
When the tip of the tendril touches support, then the auxin of that side of the tip moves away from the side of the support. As we know, auxin promotes growth. So, due to the presence of more auxin in it, the side of the tendril away from the support grows longer and faster than the support side. This type of growth makes the tendrils bend around the support.
Q.5. Design an experiment to demonstrate hydrotropism
Answer:
The movement of the plant in the direction of the stimulus is called tropism.
AIM: To demonstrate hydrotropism in plants.
PROCEDURE :
i. Plant a seedling in a vessel containing soil.
ii. Adjacent to the seedling, put a porous pot containing water.
iii. Leave the setup for a few days.
OBSERVATION :
iv. On examining the roots of seedlings, it is observed that the roots bend towards the source of water and do not grow straight.
RESULT :
It confirms that the plant shows hydrotropism as the roots bend towards the porous pot of water. Hydrotropism is a plant growth response in which the direction of growth is determined by a stimulus of the gradient in water concentration.
Topic 6.3 Hormones in Animals: Page number 111
Q.1 . How does chemical coordination take place in animals?
Answer:
In animals, chemical coordination takes place through the hormones secreted by the endocrine gland. It can also be done by the nervous system, which is called the endocrine system. Endocrine glands secrete hormones directly into the bloodstream, which directly reach the specific cells. These cells act according to the information that particular hormones carry.
Q.2. Why is the use of iodised salt advisable?
Answer:
Thyroid glands need iodine to produce the thyroxine hormone, which controls the metabolic activities in our body, such as the metabolism of carbohydrates, fats, proteins, etc. Also, due to a lack of thyroxine, a disease called goitre is caused.
That's why it advised using iodised salts.
Q.3. How does our body respond when adrenaline is secreted into the blood?
Answer:
The rate of heartbeat becomes faster when adrenaline is secreted into the blood, so that the supply of oxygen to our muscles is greater. The amount of blood to the digestive system and skin is reduced because the small arteries around the muscles of these organs contract.
As a result, it turns the direction of blood towards our skeletal muscles. The respiration function becomes faster due to the contraction of the diaphragm and rib muscles.
Q.4. Why are some patients with diabetes treated by giving injections of insulin?
Answer:
The insulin hormone regulates the level of sugar in the blood. If it is not adequately secreted, then the sugar level rises in our blood, causing many harmful effects. So, that is why diabetic patients are treated by giving injections of insulin.
Solving the Exercise Problem is a good habit, as it makes you more confident and decreases student stress. So, in this, we will cover all NCERT questions with their proper solution.
Q.1. Which of the following is a plant hormone?
(a) Insulin
(b) Thyroxin
(c) Oestrogen
(d) Cytokinin.
Answer:
The correct option is (D)
Plant hormones are auxins, gibberellins, cytokinins, etc. Insulin, thyroxine and estrogen are hormones secreted by the human body.
Q.2. The gap between two neurons is called:
(a) dendrite.
(b) synapse.
(c) axon.
(d) impulse.
Answer:
The correct option is (b)
A small space between the two nerve cells is known as the synapse. It helps in the transmission of an information signal.
Q.3. The brain is responsible for
(a) thinking.
(b) Regulating the heartbeat
(c) balancing the body.
(d) all of the above.
Answer:
The function of the brain is: thinking, regulating the heartbeat, and balancing the body. All the voluntary actions are controlled by different parts of the brain.
So, the correct option is (d)
Answer:
The function of receptors is to detect the information from the environment. These are located in our sensory organs like the eye, ear, skin, nose and tongue. For example, olfactory receptors detect smell. If these receptors do not work correctly, there will be a delay in getting information from the environment to the brain or spinal cord, and due to this, the reaction of the information is also late, which causes harmful effects on our body.
For example, if skin receptors are damaged, then we cannot get the heat as a stimulus. And if we accidentally touch a hot object, then our hands might get burned.
Q.5. Draw the structure of a neuron and explain its function.
Answer:
The structure of the nerve cell or neuron-
A neuron is the functional unit of the nervous system. It has three main parts-
The function of nerve cells-
It carries the information in the form of an electrical signal, known as nerve impulses. Cells receive a stimulus to send it to the brain, and the spinal cord carries the message from the brain to the target organs.
Q.6. How does phototropism occur in plants?
Answer :
Phototropism is the movement of any part of the plant due to light. Positive phototropism is shown by the shoot of the plant, and the root shows negative phototropism. This phenomenon is due to the plant hormone, called auxin.
When light falls on the side of the plant, the auxin hormone shifts towards the other side, which is away from the light. Thus, auxin causes growth in the length of the cells in the shady part. As a result, the plant appears to be bent towards the sun.
Q.7. Which signals will get disrupted in case of a spinal cord injury?
Answer:
In the case of spinal cord injury, the following will happen-
Q.8. How does chemical coordination occur in plants?
Answer:
Phytohormones or plant hormones are responsible for the chemical coordination in plants.
These hormones regulate the growth of the plants. For example, Auxin can help in the growth of the plant (stem), and Cytokinin is responsible for cell division.
Q.9. What is the need for a system of control and coordination in an organism?
Answer:
For the following function, an organism needs a control and coordination system-
Q.10. How are involuntary actions and reflex actions different from each other?
Answer:
INVOLUNTARY ACTION 1. Actions that occur immediately without any thinking are known as involuntary actions. 2. Involuntary actions are controlled by the mid-brain and hind-brain. Example breathing, the beating of the heart, etc | REFLEX ACTION 1. It is an immediate response to an event which does not require any processing by the brain 2. These activities are controlled by the spinal cord. Example- sneezing, coughing, etc. |
Q.11. Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
Answer:
NERVOUS MECHANISM | HORMONAL MECHANISM |
|
|
Answer:
Movement in a sensitive plant | Movement in a human leg |
|
|
|
|
Understand the principles of control and coordination well and apply them logically to effectively answer questions.
Download Ebook - NCERT Class 10 Science Ebook- Science Formulas and Diagrams
The topics and subtopics covered in the chapter Control and Coordination are:
Check NCERT Books and NCERT Syllabus here:
Question 1:
A plant growth inhibitor hormone that causes wilting of leaves is called.........
(a) Auxin
(b) Cytokinin
(c) Abscisic acid
(d) Gibberellin
Answer:
The correct answer is option(c) Abscisic acid
Explanation:
Abscisic acid is a plant growth inhibitor hormone that helps plants survive stress conditions like drought. It causes the stomata on leaves to close, reducing water loss and leading to wilting. By slowing down growth and conserving water, abscisic acid enables the plant to withstand unfavourable environments.
The chapter-wise questions and answers with all the links are given below-
Control refers to the power to regulate or restrain processes, while coordination is the harmonious functioning of different organs and systems to produce an appropriate response to stimuli. Together, they ensure the body responds effectively to internal and external changes.
The nervous system transmits electrical impulses through neurons to and from the brain and spinal cord, enabling rapid responses to stimuli. It controls voluntary, involuntary, and reflex actions by coordinating muscles and organs.
Chemical coordination in animals is regulated by hormones secreted by endocrine glands. These hormones travel through the bloodstream to target organs, controlling processes like growth, metabolism, and reproduction
Plant hormones regulate growth and responses to stimuli such as light and gravity. For example, auxins promote cell elongation and help plants bend toward light (phototropism), enabling plants to adapt to their environment.
Hello
Since you are a domicile of Karnataka and have studied under the Karnataka State Board for 11th and 12th , you are eligible for Karnataka State Quota for admission to various colleges in the state.
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After the KCET exam, you will need to participate in online counseling.
You need to select your preferred colleges and courses.
Seat allocation will be based on your rank , the availability of seats in your chosen colleges and your preferences.
4. Required Documents :
Domicile Certificate (proof that you are a resident of Karnataka).
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KCET Admit Card and Scorecard.
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Hello Aspirant, Hope your doing great, your question was incomplete and regarding what exam your asking.
Yes, scoring above 80% in ICSE Class 10 exams typically meets the requirements to get into the Commerce stream in Class 11th under the CBSE board . Admission criteria can vary between schools, so it is advisable to check the specific requirements of the intended CBSE school. Generally, a good academic record with a score above 80% in ICSE 10th result is considered strong for such transitions.
hello Zaid,
Yes, you can apply for 12th grade as a private candidate .You will need to follow the registration process and fulfill the eligibility criteria set by CBSE for private candidates.If you haven't given the 11th grade exam ,you would be able to appear for the 12th exam directly without having passed 11th grade. you will need to give certain tests in the school you are getting addmission to prove your eligibilty.
best of luck!
According to cbse norms candidates who have completed class 10th, class 11th, have a gap year or have failed class 12th can appear for admission in 12th class.for admission in cbse board you need to clear your 11th class first and you must have studied from CBSE board or any other recognized and equivalent board/school.
You are not eligible for cbse board but you can still do 12th from nios which allow candidates to take admission in 12th class as a private student without completing 11th.
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