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Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

Q1: Multiple Choice Questions (MCQs)

(i) Which part of the brain is responsible for thinking and learning?
(a) Cerebrum
(b) Cerebellum
(c) Brainstem
(d) Hypothalamus

Ans: (a)
The cerebrum is the largest part of the brain and is responsible for thinking, learning, memory, and consciousness.

(ii) Which part of the eye lets light into the eye?
(a) Eyelid
(b) Retina
(c) Pupil
(d) Iris

Ans: (c)

The pupil is the part of the eye that lets light enter. It is the small black circle in the center of the eye.

(iii) Which type of neuron carries messages from the brain to the muscles?
(a) Sensory neuron
(b) Interneuron
(c) Motor neuron
(d) None of the above

Ans: (c)
Motor neurons carry messages from the brain to the muscles, controlling movement.

(iv) Which sense organ helps us maintain balance?
(a) Eyes
(b) Nose
(c) Tongue
(d) Ears

Ans: d) 
Ears help us to hear the sounds around us. They also help us to maintain balance.

(v) Which part of the brain is responsible for involuntary actions like heartbeat and breathing?
(a) Cerebrum
(b) Medulla Oblongata
(c) Cerebellum
(d) Spinal Cord

Ans: b) 
Medulla Oblongata controls involuntary actions like movement of lungs in breathing and movement of heart, etc.

Q2: Fill in the blanks


(i) The ________ system is responsible for controlling and coordinating the functions of the body.
Ans: The nervous system is responsible for controlling and coordinating the functions of the body.

(ii) The brain and the spinal cord make up the ________ nervous system.
Ans: The brain and the spinal cord make up the central nervous system.

(iii) Neurons are the basic functional units of the ________ system.
Ans: Neurons are the basic functional units of the nervous system.

(iv) The ________ is the part of the brain responsible for higher cognitive functions.
Ans: The cerebrum is the part of the brain responsible for higher cognitive functions.

(v) The __________ protects the brain by enclosing it in a bony structure.
Ans: The skull protects the brain by enclosing it in a bony structure.

Q3: Write the functions of these parts of your body.

(i) Cerebrum - Thinking
Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

(ii) Pupil - Light enters the eye

Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

(iii) Eardrum - Vibrates when sound falls on it

Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

(iv) Medulla - Involuntary actions

(v) Cerebellum - Balance and movements

(vi) Spinal cord - Reflex action

Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

Q4: True or False

(i) The spinal cord is responsible for carrying messages between the brain and the body. 
Ans: True
The spinal cord acts as a communication bridge between the brain and different parts of the body, transmitting messages through the nerves.

(ii) The cerebrum is responsible for controlling involuntary actions. 
Ans: False
The cerebrum controls voluntary actions like thinking, learning, and emotions, whereas involuntary actions are controlled by the medulla oblongata.

(iii) The mixed nerves only carry messages from the brain to the organs.
Ans: False
 Mixed nerves work both ways – they carry messages from the brain to the organs (motor function) and from the organs to the brain (sensory function).

(iv) The medulla oblongata connects the brain to the spinal cord. 
Ans: True
The medulla oblongata is the lower part of the brain that links the brain to the spinal cord and controls vital involuntary functions like breathing and heartbeat.

(v) Eyes, ears, tongue, nose, and skin are our sense organs. 
Ans: True
These five sense organs help us perceive the world by detecting light, sound, taste, smell, and touch sensations.

Q5: Match the following

Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

Ans: 1 - (a), 2 - (d), 3 - (c), 4 - (b), 5 - (e)

Q6: Choose the odd one out

(a) 

Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

(b) Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

Ans: 

(a) Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

Tongue: It is a sense organ, while others are limbs.

(b) Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

Liver: It is the part of the digestive system, others are parts of the brain. 

Q7: Short Answer Questions.


(i) What is the main function of the nervous system?
Ans: The main function of the nervous system is to receive information from the environment, process and interpret that information, and then respond accordingly to maintain the body's homeostasis (balance) and coordinate bodily functions.

(ii) What are the two main parts of the central nervous system?
Ans: The two main parts of the central nervous system are the brain and the spinal cord.

(iii) Describe the function of a neuron.
Ans: A neuron is a specialized cell that transmits nerve impulses. It has three main parts: the cell body, dendrites, and axon. The dendrites receive information from other neurons, the cell body processes the information, and the axon sends the information to other neurons, muscles, or glands.

(iv) How are the spinal cord and brain different in their functions?
Ans: The brain is responsible for processing and interpreting information received from the environment, controlling our thoughts, emotions, and actions, whereas the spinal cord mainly serves as a conduit for transmitting information between the brain and the rest of the body.

(v) What is the difference between voluntary and involuntary actions?
Ans: Voluntary actions are those that we can consciously control, such as walking and talking. Involuntary actions are those that happen automatically without conscious control, such as breathing, heartbeat, and digestion.

(vi) Which nerve connects the eyes to the brain, and what is its function?
Ans:
The optic nerve connects the eyes to the brain and carries the image to the brain. This allows us to see and interpret visual information from our surroundings.

(vii) How do ears help us, apart from hearing?
Ans:
Ears are not only responsible for hearing but also help us to maintain balance. The inner ear contains structures that contribute to our sense of balance, allowing us to stay upright and coordinated.
Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

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FAQs on Class 5 Science - Nervous System - CBSE Worksheets Solutions - 1

1. What are the main components of the nervous system?
Ans. The main components of the nervous system include the brain, spinal cord, and peripheral nerves. The brain processes information and coordinates responses, the spinal cord transmits signals between the brain and the rest of the body, and peripheral nerves connect the central nervous system to limbs and organs.
2. How does the nervous system communicate signals throughout the body?
Ans. The nervous system communicates signals through neurons, which are specialized cells that transmit electrical impulses. When a neuron receives a signal, it generates an action potential that travels down its axon to communicate with other neurons, muscles, or glands via synapses.
3. What are the differences between the central nervous system and the peripheral nervous system?
Ans. The central nervous system (CNS) consists of the brain and spinal cord, responsible for processing and integrating information. The peripheral nervous system (PNS) includes all the nerves outside the CNS, facilitating communication between the CNS and the body, including sensory and motor functions.
4. What role does the autonomic nervous system play in the body?
Ans. The autonomic nervous system (ANS) regulates involuntary body functions such as heart rate, digestion, and respiratory rate. It has two main divisions: the sympathetic nervous system, which prepares the body for stress or emergencies, and the parasympathetic nervous system, which promotes relaxation and recovery.
5. How do neurons transmit signals, and what is the significance of neurotransmitters?
Ans. Neurons transmit signals through a process called synaptic transmission, where an action potential reaches the axon terminal, causing the release of neurotransmitters into the synaptic cleft. These chemicals bind to receptors on the next neuron, facilitating communication. Neurotransmitters are crucial for mood regulation, muscle control, and various other functions.
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