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

Q1: Match the following

Ans: 
(i) Neuron - (d) Basic functional unit of the nervous system
(ii) Central nervous system - (e) Composed of the brain and spinal cord
(iii) Peripheral nervous system - (a) Connects the brain and the rest of the body
(iv) Synapse - (b) Relays information between neurons
(v) Autonomic nervous system - (c) Controls involuntary actions 

Q2: Multiple Choice Questions (MCQs)

(ii) Which part of the nervous system controls voluntary actions?
(a) Autonomic nervous system
(b) Central nervous system
(c) Peripheral nervous system
(d) Somatic nervous system
Ans: (d)
The somatic nervous system is a part of the peripheral nervous system and controls voluntary actions.

(iii) 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.

(iv) 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.

(v) 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.

Q3: Choose the odd one out

(a) 

(b) 

(c) 

Ans: 

(a) 

Shoulders: The ball and socket joint is present in the shoulders, in others, hinge joint is found.

(b) 

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

(c) 

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

Q4: Fill in the blanks

(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 nervous system can be divided into the central nervous system and the ________ nervous system.
Ans: The nervous system can be divided into the central nervous system and the peripheral nervous system.

(v) 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.

Q5: True or False

(ii) The cerebrum is the largest part of the brain.
Ans: True
The cerebrum is the largest part of the brain, making up about 85% of its mass. It is responsible for higher cognitive functions such as thinking, decision-making, and problem-solving.

(iii) Neurons are able to regenerate if damaged.
Ans: False
Neurons, unlike other cells in the body, have a limited ability to regenerate if damaged. Some neurons can recover from minor injuries, but the majority of them cannot.

(iv) The peripheral nervous system includes the brain and spinal cord.
Ans: False
The peripheral nervous system includes nerves that connect the brain and spinal cord (central nervous system) to the rest of the body.

(v) The autonomic nervous system controls voluntary actions.
Ans: False
The autonomic nervous system controls involuntary actions such as heart rate, digestion, and respiratory rate. Voluntary actions are controlled by the somatic nervous system.

Q6: Write the functions of these parts of your body.

(i) Cerebrum - Thinking

(ii) Pupil - Light enters the eye

(iii) Eardrum - Vibrates when sound falls on it

(iv) Medulla - Involuntary actions

(v) Cerebellum - Balance and movements

(vi) Spinal cord - Reflex action

Q7: Short Answer Questions.

(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.