NCERT solutions for class 10 science chapter 7 Control and Coordination : Why does a cat run when it sees a mouse? This question is answered in NCERT solutions class 10 science chapter 7 control and coordination along with other examples. So, a cat runs because it sees a mouse and its running is also related to the movement which is controlled and coordinated. This chapter 7 of class 10 science deals with the reasons behind such movements which are basically the nervous system and harmones. You are going to learn more about the nervous system of animals, reflex actions, coordination in plants and harmones in animals in class 10 science chapter 7 control and coordination. NCERT Solutions will help in solving each and every question pertaining to these topics. Also, since class 10 is a board exam, you must need help to practice and learn NCERT solutions for class 10 science chapter 7 control and coordination. Therefore, for any doubts, you can always ask our experts by posting the questions on our platform. Students are advised to go through NCERT solutions for class 10 to score good marks in Board examination.
Types of questions asked in CBSE board exams for chapter 7 control and coordination:
There are two sections in class 10 science board exam of CBSE, section A and section B.
Section A: It carries total of 21 questions out of which 2 questions are of 1 mark, 3 questions are of 2 marks, 10 questions are of 3 marks and 6 questions are of 5 marks which makes the total of 68 marks.
Section B: It carries 6 questions of 2 marks each and such questions are based on practical skills which makes the total of 12 marks.
Therefore, 80 marks are for written test and 20 marks are for internal assessment.
NCERT class 10 science chapter 7 control and coordination- Weightage in board exams:
In 2017, there was no question asked from this chapter 7 of class 10 science control and coordination whereas in 2018 board exam 3 marks questions were asked. So, if you learn NCERT solutions for class 10 science control and coordination, you will put 3 marks in your pocket directly. Since board exams are very crucial, you must go through each and every concept behind solution of NCERT for class 10 science chapter 7 control and coordination.
NCERT solutions for class 10 science chapter 7 control and coordination topic 7.1 Animals nervous system:
Q.1. What is the difference between a reflex action and walking ?
The difference between a reflex action and walking-
| REFLEX ACTION |
- This action is performed by automatically
- It is control and coordinated by the spinal cord
- It is an involuntary action.
| WALKING |
- It is a reaction to the signal transmitted by the nerve to the muscles. Here, thinking is involved
- Brain instructs and controls the muscles of the leg to for moving.
- It is a voluntary action.
Q.2 . What happens at the synapse between two neurons ?
The synapse is the small empty 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 reaches to the other neurons with the help of dendrite. Therefore, the information signal is transmitted through one neuron to other neurons by synapse.
Q.4. How do we detect the smell of an agarbatti (incense stick) ?
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 sent this information to the olfactory lobe and respond to the information signal.
Q.5. What is the role of the brain in reflex action ?
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.
Solutions of NCERT for class 10 science chapter 7 control and coordination topic 7.2 Coordination in plants:
Q.1. What are plant hormones ?
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.
Q.2. How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light ?
Here is the difference:
| Movement of leaves of sensitive plants || Movement of 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 stimuli 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.4. How do auxins promote the growth of a tendril around a support ?
When the tip of tendril touches support, then auxin of that side of the tip is moving 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 tendril away from the support grow longer and faster than the support side. And due to this type of growth, it makes the tendrils bend around the support.
Q.5. Design an experiment to demonstrate hydrotropism
The movement of the plant in the direction of the stimulus is called tropism.
AIM: To demonstrate hydrotropism in plants.
i. Plant a seedling in a vessel containing soil.
ii. Adjacent to the seedling put a porous pot containing water.
iii. Leave the set up for a few days.
iv. On examining the roots of seedlings it is observed that the roots bend towards the source of water and do not grow straight.
It confirms that 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.
NCERT solutions for class 10 science chapter 7 control and coordination topic 7.3 Harmones in animals:
Q.1 . How does chemical coordination take place in animals ?
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 hormone directly into the bloodstream that directly reaches to the specific cells. These cells act accordingly to the information that particular hormones carry.
Q.2. Why is the use of iodised salt advisable ?
Thyroid glands need iodine to produce the thyroxine hormone which, controls the metabolic activities in our body such as metabolism of carbohydrates, fats and protein etc. Aso, due to lack of thyroxin 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 ?
The rate of heartbeat becomes faster when adrenaline is secreted into the blood so that the supply of oxygen to our muscles is more. The amount of blood to the digestive system and skin is reduced because of 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 diaphragm and rib muscles.
NCERT solutions for class 10 science chapter 7 control and coordination Exercise:
Q.1. Which of the following is a plant hormone ?
The correct option is (D)
Plant hormones are auxins, gibberellin, cytokinin etc. Insulin, thyroxine and estrogen are hormones secreted by the human body.
Q.2. The gap between two neurons is called as :
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
(b) regulating the heart beat.
(c) balancing the body.
(d) all of the above.
The function of the brain is; thinking, regulating the heartbeat, and balancing the body. All the voluntary action are controlled by the different parts of the brain.
So, the correct option is (d)
Q.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 ?
The function of receptors is to detect the information from the environment. These are located in our sensory organs like eye, ear, skin, nose and tongue. For example, olfactory receptor detect the 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 the hot object, then our hands might get burnt.
Q.5. Draw the structure of a neuron and explain its function .
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 cell-
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 ?
Phototropism is the movement of any part of the plant due to light. Positive phototropism is shown by the shoot of the plant and 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 is 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 ?
In the case of spinal cord injury, the following will happens-
- All the involuntary action will get disturbed
- Reflex action will be disturbed because reflexes are located in the spinal cord, and so, the quick response to guard ourselves will not take place.
Q.8. How does chemical coordination occur in plants ?
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 the cell division.
Q.10. How are involuntary actions and reflex actions different from each other ?
| INVOLUNTARY ACTION |
1. Actions which occurs immediately without any thinking are known as an involuntary action.
2. Involuntary actions are controlled by the mid-brain and hind-brain.
example- breathing, the beating of heart etc
| REFLEX ACTION |
1. It is an immediate response to an event which does not require any processing of by brain
2. These activities are controlled by the spinal cord.
example- sneezing, coughing etc.
NCERT Solutions for Class 10 Science - Chapter wise
Subject-wise NCERT solutions for class 10
How to use NCERT solutions for class 10 science chapter 7 control and coordination?
- Practice should be the only mantra which will help you achieve your goal of getting high scores in CBSE class 10 science exam.
- You must go through previous 5 years question papers of CBSE and its NCERT solutions of class 10 science in order to know the CBSE pattern
- You must go in detail while studying the chapter and NCERT solutions for class 10 science since in board exams though there will be direct questions from NCERT yet some of the questions will be based out of concepts studied.