NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination

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Updated at 2021-05-07


NCERT solutions for class 10 Science Chapter 7 Control And Coordination Exercise

Q1 )

Which of the following is a plant hormone?

  1. Insulin
  2. Thyroxin
  3. Oestrogen
  4. Cytokinin



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Answer: (d)Cytokinin

Q2 )

The gap between two neurons is called a

  1. dendrite
  2. Synapse
  3. Axon
  4. Impulse



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Answer: (b)synapse

Q3 )

The brain is responsible for

  1. Thinking
  2. regulating the heart beat.
  3. balancing the body.
  4. all of the above.



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Answer: (d)All of the above.

Q4 )

What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

All information from our environment is detected by the specialised tips of some nerve cells. These receptors are usually located in our sense organs, such as the inner ear, the nose, the tongue, and so on. So gustatory receptors will detect taste while olfactory receptors will detect smell. We detect that we are touching a hot object by the action of receptors present on various organs or tissues. If olfactory receptor not works properly then we are not able to smell things like aggarbatti, perfumes, flavour of food.

Q5 ) Draw the structure of a neuron and explain its function.



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :


A neurons consists of three parts:
(i) Cell body: It is a typical animal cell which contains cytoplasm and a nucleus.
(ii) Dendrites: A number of long and thin fibres comes out from the cell body of the neurons, they are nerve fibre. The shorter fibres on the cell body of neurons are called dendrites.
(iii) Axon: The longest fibre on the cell body of neurons is called axon. It has an insulating and protective sheath (or cover)of myelin around it.

Function of Neuron:-
(I) The impulses of information travel from dentrites to the cell body, and then along the axon to its end.
(ii) These impulses cross the synapse. At the end , the impulses travel form one neuron to the other up to the spinal cord or to the concerned part of the body.

Q6 ) How does phototropism occur in plants?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :


Photo means light. The response of plant towards the environmental triggers, light which change the directions that plant parts grow in is called phototropism. The directional, or tropic, movements can be either towards the light, or away from it. So, in two different kinds of phototropic movement, shoots respond by bending towards light while roots respond by bending away from it.

For example: Sunlight bends towards the sun from where the light is coming. This is the response of sunflower towards the plants.

Q7 ) Which signals will get disrupted in case of a spinal cord injury?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Answer:
Reflex actions are involuntary actions and controlled by the spinal cord thus, gets disrupted in case of spinal cord injury.

Q8 ) How does chemical coordination occur in plants?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :


Plants do not have nervous system but still sense the things because of stimulus such as gravity, light, chemicals(hormones), water, touch (touch -me -not plant).Hormones are responsible for the chemical coordination of plants by integrating their behaviour by affecting growth of a plant resulting in movement of that plant part in response to a stimulus. When sunlight falls on the shoot from one side, the auxins hormone causes the shady side of the shoot to grow faster, making the shoot bend towards sunlight.

Q9 ) What is the need for a system of control and coordination in an organism?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :


Controlled movement must be connected to the recognition of various events in the environment, followed by only the correct movement in response. In other words, living organisms must use systems providing control and coordination. In keeping with the general principles of body organisation in Multicellular organisms, specialised tissues are used to provide these control and coordination activities.

(i) Coordination is needed for all human activities like, thinking and behaviour. Our breathing process, hearts beats, we dance, read, write by the action of our nervous system. Our nervous system gets information from surroundings and processes it and then respond according to it. The endocrine system (hormonal system) helps in integrating various metabolic activities like reproduction, development, all reflex actions (cope up with various give up situations).

(ii)The hormonal system in plants helps in process of photosynthesis; they need carbon dioxide, water and sunlight. The stomatal opening in leaves opens up to allow in carbon dioxide gas, the roots bend towards water and the stem grows towards sunlight, the tendrils in climbing pants are supported by the hormonal system of the plant body.

Thus, we have need of control and coordination system in an organisms.

Q10 ) How are involuntary actions and reflex actions different from each other?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Involuntary action is the set of muscle movement which do not require thinking. But it is controlled by brain for example beating of heart beat.

While on the other hand, the reflex action is rapid and spontaneous action in response to any stimulus. For example closing of eyes immediately when bright light is focused.

Q11 ) Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :


Nervous system Hormonal system
Made up of neurons made up of secrotory cells
messages transmitted in the form of electrical impulses messages transmitted in the form of chemicals called harmones.
messages are transmitted along nerve fibre. messages are transmitted along blood stream.
Effect of message usually lasts for a very short while. Effect of message usually lasts longer.
Messages travel very quickly. Messages travel more slowly.

Q12 ) What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :


Movement in sensitive plants Movement in our legs
The movement in a sensitive plant is a response to stimulus which is a voluntary action. Movement in our legs is a voluntary action.
No special tissue is there for the transfer of information. A complete system CNS and PNS is there for the information exchange.
Plant cells do not have specialised protein for movaments. Animal cells have specialised protein which help muscles to contract.

Q1 )

Which of the following is a plant hormone?

  1. Insulin
  2. Thyroxin
  3. Oestrogen
  4. Cytokinin



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Answer: (d)Cytokinin

Q2 )

The gap between two neurons is called a

  1. dendrite
  2. Synapse
  3. Axon
  4. Impulse



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Answer: (b)synapse

Q3)The brain is responsible for

  1. Thinking
  2. regulating the heart beat.
  3. balancing the body.
  4. all of the above.



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Answer: (d)All of the above.

Q4)What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Answer:
All information from our environment is detected by the specialised tips of some nerve cells. These receptors are usually located in our sense organs, such as the inner ear, the nose, the tongue, and so on. So gustatory receptors will detect taste while olfactory receptors will detect smell. We detect that we are touching a hot object by the action of receptors present on various organs or tissues. If olfactory receptor not works properly then we are not able to smell things like aggarbatti, perfumes, flavour of food.

Q5)Draw the structure of a neuron and explain its function.



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :


A neurons consists of three parts:
(i) Cell body: It is a typical animal cell which contains cytoplasm and a nucleus.
(ii) Dendrites: A number of long and thin fibres comes out from the cell body of the neurons, they are nerve fibre. The shorter fibres on the cell body of neurons are called dendrites.
(iii) Axon: The longest fibre on the cell body of neurons is called axon. It has an insulating and protective sheath (or cover)of myelin around it.
Function of Neuron:-
(I) The impulses of information travel from dentrites to the cell body, and then along the axon to its end.
(ii) These impulses cross the synapse. At the end , the impulses travel form one neuron to the other up to the spinal cord or to the concerned part of the body.

Q6) How does phototropism occur in plants?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :


Photo means light. The response of plant towards the environmental triggers, light which change the directions that plant parts grow in is called phototropism. The directional, or tropic, movements can be either towards the light, or away from it. So, in two different kinds of phototropic movement, shoots respond by bending towards light while roots respond by bending away from it. For example: Sunlight bends towards the sun from where the light is coming. This is the response of sunflower towards the plants.

Q7) Which signals will get disrupted in case of a spinal cord injury?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Reflex actions are involuntary actions and controlled by the spinal cord thus, gets disrupted in case of spinal cord injury.

Q8) How does chemical coordination occur in plants?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Plants do not have nervous system but still sense the things because of stimulus such as gravity, light, chemicals(hormones), water, touch (touch -me -not plant).Hormones are responsible for the chemical coordination of plants by integrating their behaviour by affecting growth of a plant resulting in movement of that plant part in response to a stimulus. When sunlight falls on the shoot from one side, the auxins hormone causes the shady side of the shoot to grow faster, making the shoot bend towards sunlight.

Q9) What is the need for a system of control and coordination in an organism?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Controlled movement must be connected to the recognition of various events in the environment, followed by only the correct movement in response. In other words, living organisms must use systems providing control and coordination. In keeping with the general principles of body organisation in Multicellular organisms, specialised tissues are used to provide these control and coordination activities.
(i) Coordination is needed for all human activities like, thinking and behaviour. Our breathing process, hearts beats, we dance, read, write by the action of our nervous system. Our nervous system gets information from surroundings and processes it and then respond according to it. The endocrine system (hormonal system) helps in integrating various metabolic activities like reproduction, development, all reflex actions (cope up with various give up situations).
(ii)The hormonal system in plants helps in process of photosynthesis; they need carbon dioxide, water and sunlight. The stomatal opening in leaves opens up to allow in carbon dioxide gas, the roots bend towards water and the stem grows towards sunlight, the tendrils in climbing pants are supported by the hormonal system of the plant body.
Thus, we have need of control and coordination system in an organisms.

Q10) How are involuntary actions and reflex actions different from each other?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Involuntary action is the set of muscle movement which do not require thinking. But it is controlled by brain for example beating of heart beat. While on the other hand, the reflex action is rapid and spontaneous action in response to any stimulus. For example closing of eyes immediately when bright light is focused.

Q11) Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Nervous system Hormonal system
Made up of neurons made up of secrotory cells
messages transmitted in the form of electrical impulses messages transmitted in the form of chemicals called harmones.
messages are transmitted along nerve fibre. messages are transmitted along blood stream.
Effect of message usually lasts for a very short while. Effect of message usually lasts longer.
Messages travel very quickly. Messages travel more slowly.

Q12) What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Movement in sensitive plants Movement in our legs
The movement in a sensitive plant is a response to stimulus which is a voluntary action. Movement in our legs is a voluntary action.
No special tissue is there for the transfer of information. A complete system CNS and PNS is there for the information exchange.
Plant cells do not have specialised protein for movaments. Animal cells have specialised protein which help muscles to contract.

NCERT solutions for class 10 Science Chapter 7 Control And Coordination Intext Exercise

Q1 ) What is the difference between a reflex action and walking?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

A reflex action is an sudden involuntary reaction or rapid and automatic response to a stimuli.On the other hand, walking is a voluntary action, which requires our thinking and is within our control and is part of routine activities

Q2 ) What happens at the synapse between two neurons?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Transmission of nerve impulses between two neurons takes place at through the synapse which is the small empty space between two nerve cells. The axon terminal of a neuron releases specialized chemicals called neurotransmitters which travel through the synapse and reach the dendrites of the next neuron. The nerve impulses travel along with the neurotransmitters.Thus, information is transmitted from one nerve cell to other nerve cell by synapse

Q3 ) Which part of the brain maintains posture and equilibrium of the body?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Cerebellum is responsible for maintaining posture and equilibrium of the body.

Q4 ) How do we detect the smell of an agarbatti (incense stick)?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

The smell of agarbatti (incense stick) diffuses in the air and the smell is detected by olfactory receptors present in the nostrils. Brain receives the information and sends this information to the olfactory lobe by sensory nerves located in the brain.The brain interprets those signals and we detect the smell of an agarbatti (incense stick).

Q5 ) What is the role of the brain in reflex action?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

There is no direct involvement of brain in reflex actions. These involuntary actions are controlled by the spinal cord and the action takes place immediately before the information is sent to the brain.

Q6 ) What are plant hormones?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Plant hormones(also known as phytohormones) are the chemical substances which help in controlling growth, flowering, height, development of plants and their response to the environment.Various types of phytohormones are – auxins, gibberellins, cytokinins, abscisic acid and ethylene.

Q7 ) How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Movement of leaves of sensitive plant:
It is a nastic movement which does not depend on the direction of stimulus(touch). It is caused by the sudden loss of water from the swellings at the base of leaves.It is not a growth movement.

Movement of a shoot towards light:

It is a tropic movement which depends on the direction of stimulus(light) coming . It is a growth movement and is caused by the unequal growth on the two sides of the shoot.

Q8 ) Give an example of a plant hormone that promotes growth.



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Auxin is an example of a plant hormone that promotes growth.

Q9 ) How do auxins promote the growth of a tendril around a support?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Auxins are the plant hormones present at the tip of tendrils.Growth of tendrils slow down if they are attached around any support because auxins are sensitive to touch. This makes them move to the other side of the tip to get support and results in making the other side grow faster than the side of tendril in contact with the support and the tendril bends towards the support.

Q10 ) Design an experiment to demonstrate hydrotropism.



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

To demonstrate hydrotropism in plants we can setup arrangements as follows:
i. Take a big vessel and plant a seedling in the vessel containing soil.

ii. Take a porous pot containing water adjacent to the seedling and fix it.

iii. Leave the set up for a few days.

Observation :After a few days it is observed that the roots bend towards the source of water (porous pot ) rather than growing straight.

Conclusion:As the roots grow towards the porous pot with water it is confirmed that the plant shows hydrotropism. We know that hydrotropism is a plant growth response in which the direction of growth is determined by a stimulus of gradient in water concentration.


Q11 ) How does chemical coordination take place in animals?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Hormones take care of the chemical coordination in animals .Various types of hormones are secreted by several endocrine glands.These hormones regulate different functions such as regulation of growth, development etc. in the body. For example; insulin :a hormone which regulates blood sugar level.

Q12 ) Why is the use of iodised salt advisable?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Iodine is an important constituent of the hormone thyroxine and it’s deficiency leads to a disease called goiter. So Iodised salt is advised to prevent chances of goiter.

Q13 ) How does our body respond when adrenaline is secreted into the blood?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Adrenaline hormone is secreted in large amounts when a person is frightened, or mentally disturbed and prepares the body for emergency situations. When it reaches the heart, it beats faster to supply more oxygen to our muscles. Contractions of diaphragm and the rib muscles leads to the increase in breathing rate. It also raises the blood pressure, and allows more glucose to enter into the blood. Slight precipitation also occurs on the temple and in palms.All these collectively shows the body is prepared for emergency situations.

Q14 ) Why are some patients of diabetes treated by giving injections of insulin?



NCERT Solutions for Class 10 Science Chapter 7 Control And Coordination


Answer :

Insulin is produced by pancreatic cells which regulates blood glucose by converting extra glucose to glycogen.Diabetes is the condition when the secretion of insulin gets reduced or stopped which leads to adverse effect to a person’s body.In order to maintain the insulin and blood glucose level, the patients of diabetes treated by giving injections of insulin.



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