NCERT Solutions for Class 10 Science Unit 7

Control and Coordination Class 10

Unit 7 Control and Coordination Exercise Solutions

A living being does not live in isolation. It has to constantly interact with its external environment and has to respond properly for its survival. For example; when a hungry lion spots a deer, the lion has to quickly make a move so that it can have its food. On the other hand, the deer needs to quickly make a move to run for its life. The responses which a living being makes in relation to external stimuli are controlled and coordinated by a system; especially in complex animals.
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Question : Solutions of Questions on Page Number : 119

Q1 :  

What is the difference between a reflex action and walking?


Answer :

A reflex action is a rapid, automatic response to a stimulus. It does not involve any thinking. For example, we close our eyes immediately when the bright light is focused. Walking, on the other hand, is a voluntary action. It is under our conscious control.

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Q2 :  

What happens at the synapse between two neurons?


Answer :

A very small gap that occurs between the last portion of axon of one neuron and the dendron of the other neuron is known as a synapse. It acts as a one way valve to transmit impulses in one direction only. This uni-direction transfer of impulses occurs as the chemicals are produced in only one side of the neuron i.e., the axon's side. From axon, the impulses travel across the synapse to the dendron of the other neuron.

A synapse or neuromuscular junction

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Q3 :  

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


Answer :

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Q4 :  

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


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Q5 :  

What is the role of the brain in reflex action?


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Q6 :  

What are plant hormones?


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Q7 :  

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


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Q8 :  

Give an example of a plant hormone that promotes growth.


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Q9 :  

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


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Q10 :  

Design an experiment to demonstrate hydrotropism.


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<< Previous Chapter 6 : Life Processes Next Chapter 8 : How do Organisms Reproduce? >>

Questionexercise : Solutions of Questions on Page Number : 125

Q1 :  

How does chemical coordination take place in animals?


Answer :

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Q2 :  

Which of the following is a plant hormone?

(a) Insulin

(b) Thyroxin

(c) Oestrogen

(d) Cytokinin


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Q3 :  

Why is the use of iodised salt advisable?


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Q4 :  

The gap between two neurons is called a

(a) dendrite.

(b) synapse.

(c) axon.

(d) impulse.


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Q5 :  

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


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Q6 :  

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


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<< Previous Chapter 6 : Life Processes Next Chapter 8 : How do Organisms Reproduce? >>

Exercise : Solutions of Questions on Page Number : 126

Q1 :  

The brain is responsible for

(a) thinking.

(b) regulating the heart beat.

(c) balancing the body.

(d) all of the above.


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Q2 :  

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


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Q3 :  

Draw the structure of a neuron and explain its function.


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Q4 :  

How does phototropism occur in plants?


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Q5 :  

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


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Q6 :  

How does chemical coordination occur in plants?


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Q7 :  

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


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Q8 :  

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


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Q9 :  

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


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Q10 :  

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


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Science : CBSE NCERT Exercise Solutions for Class 10th for Control and Coordination will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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