Class 10 Science Chapter 7 NCERT Solution Intext & Exercise

Chapter 7 of Science Subject of Class 10 is Control and Coordination. NCERT Solutions (Intext and End Exercise Questions) for Science Chapter 7 are provided on this page.

Class 10 Science Chapter 7 – Control and Coordination

Chapter 7 of Class 10 Science NCERT Text book is Control and Coordiantion. The end exercise of this chapter consists of a total of 12 questions. These end exercise questions are related to Control and Coordination, reflex action, nervous system, Human Brain , Hormones in Animals and Human Beings , etc

Chapter 7 : Control and Coordination ( NCERT Solutions )

SubjectScience
Class 10
Chapter Chapter 7 : Control and Coordination
Study MaterialNCERT Solutions ( End Exercise and Intext Questions )
Total Questions 12 Questions
Text BookNCERT Text Book ( Updated Syllabus)

Class 10 Science Chapter 7 Question 1 :
Which of the following is a plant hormone?

(a) Insulin
(b) Thyroxin
(c) Oestrogen
(d) Cytokinin

Answer : Option [ d ] “Cytokinin” is correct answer.
Cytokinin is a plant hormone.

Class 10 Science Chapter 7 Question 2 :
The gap between two neurons is called a

(a) dendrite.
(b) synapse.
(c) axon.
(d) impulse

Answer : Option [ b ] “Synapse” is correct answer.
The gap between neurons is called a Synapse.

Question 3 :
The brain is responsible for

(a) thinking.
(b) regulating the heart beat.
(c) balancing the body.
(d) all of the above

Answer : Option [ d ] “all of above” is correct answer.

Class 10 Science Chapter 7 Question 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?

Answer :
The receptors in our body helps to collect information from our environment detected by the specialised tips of some nerve cells. These receptors are located on our sense organs.
Think of situation like while taking dinner, if we block our nose , then we cannot appreciate the taste of food that we eat. We cannot enjoy the environment situation.

Class 10 Science Chapter 7 Question 5 :
Draw the structure of a neuron and explain its function.

Answer :
Function of Neuron :
When the information is acquired at the end of dendritic tip of a nerve cell is sets off a chemical reaction that creates an electrical impulse , This impulse travels from the dendrite to cell body and them along the axon to its end.
At the end of axon, the electrical impulse sets off the release of some chemicals. These chemicals cross the gap or synapse and starts a similar electrical impulse in a dendrite of the next neuron. Therefore, it is specialised in winding information via electrical impulses from one part of the body to another.

Neuron image for class 10 science chapter 7
Neuron

Class 10 Science Chapter 7 Question 6 :
How does phototropism occur in plants?

Answer :
Phototropism is a response of a plant to light. When growing plant is illuminated by unidirectional light, the shoots bend towards the light. The shoot are said to be positively phototropic, while the roots are negatively phototropic as they grow away from the light.

Class 10 Science Chapter 7 Question 7 :
Which signals will get disrupted in case of a spinal cord injury?

Answer :
Reflex action or message to brain and involuntary action will get disrupted in case of spinal cord injury.

Class 10 Science Chapter 7 Question 8 :
How does chemical coordination occur in plants

Answer :
In plants, chemical coordination occur with the help of plant hormones. Different plant hormones help to coordinate growth development and responses to the environment. They are synthesised at places away from where they act and simply diffuse to the area of action. For example – Auxin.
Another example is gibberellins which help in growth of stem .
Cytokinin promote cell division.

Class 10 Science Chapter 7 Question 9 :
What is the need for a system of control and coordination in an organism?

Answer :
Need for a system of control and coordination in an organism
1. To give response to external stimuli.
2. For proper growth and development of organism
3. For Survival
4. For communication in nervous via nerve impulse.
5. For interaction between the environment and individual itself.

Class 10 Science Chapter 7 Question 10 :
How are involuntary actions and reflex actions different from each other?

Answer :
Difference between Involuntary actions and reflex actions-

Involuntary actionsReflex actions
They involve autonomous nervous systemThey involve all parts of voluntary nervous system
They usually occur in response to internal stimuli They operate against harmful stimuli
They are connected with functioning of internal body partsThey are connected with emergency
These are regulated by medulla They are controlled by spinal cord
The speed of response is slower than reflex actionThe speed of response is very fast

Class 10 Science Chapter 7 Question 11 :
Compare and contrast nervous and hormonal mechanisms for control and coordination in animals
.

Answer :
Difference between nervous control and hormonal control control in animals

Nervous control Hormonal control
Information is fast through electrochemical conductionInformation is sent through blood stream as a chemical substance
Information travels rapidlyInformation travels slowly
Response is immediateResponse is slow
Its effects short lived Its effects are more prolong

Comparison : both the mechanism interact and are involved in the –
1. Control and coordination of various functions in the body .
2. Interaction between environment and the body .

Class 10 Science Chapter 7 Question 12 :
What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?

Answer :
Difference between movement in sensitive plants and movement in our legs.

Movement in sensitive plantsMovement in our legs
It occurs in response to an external stimulus like touch and shock.It occurs in response to our requirement and is determined by will.
No nerves are involved.Nerve carry message for movement of legs.
It is controlled by plant hormonesIt is controlled by nerves and cerebellum.