Nervous System Online Test 10th Science Lesson 15 Questions in English

Nervous System Online Test 10th Science Lesson 15 Questions in English

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Question 1
Which of the following statement is incorrect?
  1. One of the characteristic features of all living organisms is responding to stimuli
  2. Stimulus refers to the changes in the environmental condition, that are detected by receptors present in the body
A
1 alone
B
2 alone
C
1, 2
D
None
Question 1 Explanation: 
One of the characteristic features of all living organisms is responding to stimuli. Stimulus refers to the changes in the environmental condition, that are detected by receptors present in the body
Question 2
To which of the following living organism responds to?
  1. Heat
  2. Light
  3. Force of gravity
  4. Smell
A
1, 2, 3
B
1, 2, 4
C
2, 3, 4
D
All the above
Question 2 Explanation: 
Relevant changes in the activities of organisms to a particular- stimuli are called their reactions or responses. Living organisms show their response to different kinds of stimuli like light, heat, cold, sound, smell, taste, touch, pressure, pain or the force of gravity etc.
Question 3
Which of the following statement is correct?
  1. To provide the correct response to a stimulus, it is necessary that all the organs work together in a proper coordinated manner
  2. The working together of various organs in a systematic, controlled and efficient way to produce proper response to various stimuli is called coordination
A
1 alone
B
2 alone
C
1, 2
D
None
Question 3 Explanation: 
To provide the correct response to a stimulus, it is necessary that all the organs work together in a proper coordinated manner. This working together of various organs in a systematic, controlled and efficient way to produce proper response to various stimuli is called coordination.
Question 4
Cells and organs is essential for their diverse activities to maintain physiological balance called___
A
Homeolysis
B
Homeostasis
C
Homeotherm
D
Homo erectus
Question 4 Explanation: 
In animals including human the coordination between the various cells and organs is essential for their diverse activities to maintain physiological balance called homeostasis.
Question 5
How many distinct components are there in Nervous system?
A
2
B
4
C
3
D
5
Question 5 Explanation: 
The nervous system is made up of nervous tissues. It is formed of three distinct components namely the neurons, neuroglia and nerve fibres.
Question 6
______ is the structural and functional unit of the nervous system
A
Nerve cell
B
Neuroglia
C
Nerve fibre
D
All the above
Question 6 Explanation: 
A neuron or nerve cell is the structural and functional unit of the nervous system. Information is conducted through neurons in the form of electrical impulses from one part of the body to another.
Question 7
What is the length of Neuron?
A
100µm
B
10mm
C
1µm
D
20µm
Question 7 Explanation: 
Neuron or nerve cell is the longest cell of the human body with a length of over 100µm. These cells are highly specialised to detect, receive and transmit different kinds of stimuli.
Question 8
______ are also called as glial cells
A
Neuron
B
Neuroglia
C
Nerve fibre
D
All the above
Question 8 Explanation: 
Neuroglia is also called as glial cells. They are non-exciting, supporting cell of the nervous system. They do not initiate or conduct nerve impulses.
Question 9
Which of the following statement about nerve fibre is correct?
  1. The nerve fibres are the long slender processes of neurons
  2. A number of nerve fibres are bundled up together to form nerves
A
1 alone
B
2 alone
C
1, 2
D
None
Question 9 Explanation: 
The nerve fibres are the long slender processes of neurons. A number of nerve fibres are bundled up together to form nerves.
Question 10
How many basic parts does neurons have?
A
4
B
5
C
2
D
3
Question 10 Explanation: 
A neuron typically consists of three basic parts: Cyton, Dendrites and Axon. A neuron or nerve cell is the structural and functional unit of the nervous system.
Question 11
Which of the following statement about Cyton is correct?
  1. Cyton is also called cell body or perikaryon
  2. It has a central nucleus with abundant cytoplasm called neuroplasm.
A
1 alone
B
2 alone
C
1, 2
D
None
Question 11 Explanation: 
Cyton is also called cell body or perikaryon. It has a central nucleus with abundant cytoplasm called Neuroplasm.
Question 12
Which of the following statement is correct?
  1. Neurons have the ability to divide
  2. Several neurofibrils are present in the cytoplasm that help in transmission of nerve impulses to and from the cell body
A
1 alone
B
2 alone
C
1, 2
D
None
Question 12 Explanation: 
The cytoplasm has large granular body called Nissl’s granules and the other cell organelles like mitochondria, ribosomes, lysosomes, and endoplasmic reticulum. Neurons do not have the ability to divide. Several neurofibrils are present in the cytoplasm that help in transmission of nerve impulses to and from the cell body.
Question 13
_____ conduct nerve impulses towards the cyton
A
Axon
B
Dendrites
C
Glial cells
D
All the above
Question 13 Explanation: 
Dendrites are the numerous branched cytoplasmic processes that project from the surface of the cell body. They conduct nerve impulses towards the cyton.
Question 14
Which of the following statement is correct?
  1. The axon is a single, elongated, slender projection
  2. The end of axon terminates as fine branches which terminate into knob like swellings called synaptic knob
  3. It carries impulses away from the dendron
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 14 Explanation: 
The axon is a single, elongated, slender projection. The end of axon terminates as fine branches which terminate into knob like swellings called synaptic knob. The plasma membrane of axon is called axolemma, while the cytoplasm is called axoplasm. It carries impulses away from the cyton. The axons may be covered by a protective sheath called myelin sheath which is further covered by a layer of Schwann cells called neurilemma.
Question 15
Which of the following statement is correct?
  1. Myelin sheath breaks at intervals by depressions called Nodes of Ranvier
  2. Myelin sheath acts as insulator and ensures rapid transmission of nerve impulses
  3. The region between the nodes is called as internode
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 15 Explanation: 
The axons may be covered by a protective sheath called myelin sheath which is further covered by a layer of Schwann cells called neurilemma. Myelin sheath breaks at intervals by depressions called Nodes of Ranvier. The region between the nodes is called as internode. Myelin sheath acts as insulator and ensures rapid transmission of nerve impulses.
Question 16
Which of the following statement is correct?
  1. A junction between synaptic knob of axon of one neuron and Cyton of next neuron is called synaptic junction
  2. Information from one neuron can pass to another neuron through these junctions with the release of chemicals known as neurotransmitters
A
1 alone
B
2 alone
C
1, 2
D
None
Question 16 Explanation: 
A junction between synaptic knob of axon of one neuron and dendron of next neuron is called synaptic junction. Information from one neuron can pass to another neuron through these junctions with the release of chemicals known as neurotransmitters from the synaptic knob.
Question 17
Which of the following statement is correct?
  1. Only one nerve process arises from the cyton which acts as both axon and dendron in Bipolar neuron
  2. The cyton gives rise to many dendrons and an axon in Multipolar neuron
A
1 alone
B
2 alone
C
1, 2
D
None
Question 17 Explanation: 
Structurally the neurons may be of the following types: Unipolar neurons: Only one nerve process arises from the cyton which acts as both axon and dendron. Bipolar neurons: The cyton gives rise to two nerve processes of which one acts as an axon while another as a dendron Multipolar neurons: The cyton gives rise to many dendrons and an axon
Question 18
Match the following
  1. Unipolar Neurons           1. Found in cerebral cortex of brain
  2. Bipolar Neurons              2. Found in early embryos only
  3. Multipolar Neurons        3. Found in retina of eye
A
2, 1, 3
B
2, 3, 1
C
3, 1, 2
D
3, 2, 1
Question 18 Explanation: 
Explanation Unipolar Neurons- Found in early embryos but not in adult Bipolar Neurons- Found in retina of eye and olfactory epithelium of nasal chambers Multipolar Neurons- Found in cerebral cortex of brain
Question 19
Match the following
  1. Sensory neurons        1. Impulses from CNS to effector organ
  2. Motor neurons             2. Impulses from the sense organ to the CNS
  3. Association neurons        3. Impulses between sensory and motor neurons
A
2, 1, 3
B
2, 3, 1
C
3, 1, 2
D
3, 2, 1
Question 19 Explanation: 
Sensory or afferent neurons which carry impulses from the sense organ to the central nervous system. Motor or efferent neurons which carry impulses from the central nervous system to effector organ such as the muscle fibre or the gland. Association neurons conduct impulses between sensory and motor neurons.
Question 20
Which of the following statement is correct?
  1. Nerve fibres are of two types based on the presence or absence of myelin sheath
  2. Myelinated and non-myelinated nerve fibres form the white matter and grey matter of the brain
A
1 alone
B
2 alone
C
1, 2
D
None
Question 20 Explanation: 
Nerve fibres are of two types based on the presence or absence of myelin sheath. Myelinated and non-myelinated nerve fibres form the white matter and grey matter of the brain.
Question 21
Which of the following statement is incorrect?
  1. In Myelinated nerve fibre, axon is covered with myelin sheath
  2. In Non-myelinated nerve fibre, axon is not covered by myelin sheath
A
1 alone
B
2 alone
C
1, 2
D
None
Question 21 Explanation: 
Myelinated nerve fibre: The axon is covered with myelin sheath Non-myelinated nerve fibre: The axon is not covered by myelin sheath.
Question 22
Which of the following is not a receptor organ?
A
Skin
B
Eyes
C
Pharynx
D
Nose
Question 22 Explanation: 
All the information from the environment are detected by the receptors located in our sense organs such as the eyes, the nose, the skin, etc.
Question 23
Which of the following statement is correct?
  1. Information from the receptors is transmitted as electrical impulse and is received by the dendritic tips of the neuron
  2. This impulse travels from the dendrite to the cell body and then along the axon to its terminal end
A
1 alone
B
2 alone
C
1, 2
D
None
Question 23 Explanation: 
Information from the receptors is transmitted as electrical impulse and is received by the dendritic tips of the neuron. This impulse travels from the dendrite to the cell body and then along the axon to its terminal end. On reaching the axonal end, it causes the nerve endings to release a chemical (neurotransmitter) which diffuses across a synapse and starts a similar electrical impulse in the dendrites of the next neuron, then to their cell body to be carried along the axon.
Question 24
The flow of nerve impulses from axonal end of one neuron to dendrite of another neuron through_
A
Axon
B
Cyton
C
Dendron
D
Synapse
Question 24 Explanation: 
The flow of nerve impulses from axonal end of one neuron to dendrite of another neuron through a synapse is called synaptic transmission.
Question 25
Each neuron can transmit____ nerve impulses per second
A
100
B
1000
C
10
D
500
Question 25 Explanation: 
Each neuron can transmit 1000 nerve impulses per second and make as many as ten thousand of synaptic contacts with other neurons.
Question 26
The important neurotransmitter released by neurons is called_____
A
Prolactin
B
Lipase
C
Acetylcholine
D
Chloroquine
Question 26 Explanation: 
Neurotransmitters are the chemicals which allow the transmission of nerve impulse from the axon terminal of one neuron to the dendron of another neuron or to an effector organ. The important neurotransmitter released by neurons is called Acetylcholine.
Question 27
Which of the following statement is correct?
  1. The complexity of nervous system can be observed during the course of evolution
  2. We the human beings differ from other animals in our ability to think and take actions, which is due to the well-developed nervous system.
A
1 alone
B
2 alone
C
1, 2
D
None
Question 27 Explanation: 
The complexity of nervous system can be observed during the course of evolution. We the human beings differ from other animals in our ability to think and take actions, which is due to the well-developed nervous system.
Question 28
Human nervous system is differentiated into_____
A
2
B
3
C
5
D
4
Question 28 Explanation: 
Human nervous system is differentiated into three: central nervous system (CNS), peripheral nervous system (PNS) and autonomic nervous system (ANS).
Question 29
______ consists of the brain and the spinal cord
A
CNS
B
ANS
C
PNS
D
All the above
Question 29 Explanation: 
The CNS acts as centre for information processing and control. It consists of the brain and the spinal cord. The PNS is made up of the nerves which connect the brain and spinal cord to all parts of the body. The ANS is formed of sympathetic and parasympathetic nerves.
Question 30
Which of the following statement is correct?
  1. The brain and the spinal cord being delicate vital structures are well protected in bony cavities of the skull and the vertebral column respectively
  2. PNS is formed of two types of matter such as white matter or grey matter
A
1 alone
B
2 alone
C
1, 2
D
None
Question 30 Explanation: 
The brain and the spinal cord being delicate vital structures are well protected in bony cavities of the skull and the vertebral column respectively. CNS is formed of two types of matter such as white matter or grey matter with respect to the presence or absence of myelin sheath which we have discussed earlier.
Question 31
The brain is covered by _____ connective tissue membrane
A
2
B
5
C
3
D
4
Question 31 Explanation: 
The brain is the controlling centre of all the body activities. It is covered by three connective tissue membrane or meninges.
Question 32
Match the following
  1. Duramater                               1. Innermost
  2. Arachnoid membrane        2. Outermost
  3. Piamater                           3. Middle membrane
A
2, 1, 3
B
2, 3, 1
C
3, 1, 2
D
3, 2, 1
Question 32 Explanation: 
Duramater (dura: tough; mater: membrane) is the outermost thick fibrous membrane Arachnoid membrane (arachnoid: spider) is the middle, thin vascular membrane providing web like cushion Piamater (Pia: soft or tender) is the innermost, thin delicate membrane richly supplied with blood.
Question 33
The most common causes of meningitis______
  1. Bacterial
  2. Viral
  3. Fungal
A
1, 2
B
1 alone
C
2 alone
D
All the above
Question 33 Explanation: 
Meningitis is an inflammation of the meninges. It can occur when fluid surrounding the meninges becomes infected. The most common causes of meningitis are viral and bacterial infections.
Question 34
A human brain is formed of___ main parts
A
2
B
4
C
3
D
5
Question 34 Explanation: 
Meningeal membranes protect the brain from mechanical injury. A human brain is formed of three main parts: (a) forebrain (b) midbrain and (c) hindbrain.
Question 35
The forebrain is formed of____
  1. Cerebellum
  2. Cerebrum
  3. Pons
  4. Diencephalon
A
2, 3
B
2, 4
C
1, 3, 4
D
All the above
Question 35 Explanation: 
The forebrain is formed of cerebrum and diencephalon. The latter consists of dorsal thalamus and ventral hypothalamus.
Question 36
Cerebrum is nearly____ of the brain
A
Two third
B
Three fourth
C
One fourth
D
Two fifth
Question 36 Explanation: 
Cerebrum is the largest portion forming nearly two third of the brain. The cerebrum is longitudinally divided into two halves as right and left cerebral hemispheres by a deep cleft called median cleft.
Question 37
The outer portion of each cerebral hemisphere is formed of____ matter
A
White
B
Grey
C
Both a and b
D
Reddish Brown
Question 37 Explanation: 
Two cerebral hemispheres are interconnected by thick band of nerve fibres called corpus callosum. The outer portion of each cerebral hemisphere is formed of grey matter and is called cerebral cortex.
Question 38
The inner or deeper part is formed of_____ matter
A
White
B
Grey
C
Both a and b
D
Reddish Brown
Question 38 Explanation: 
The inner or deeper part is formed of white matter and is called cerebral medulla. The cortex is extremely folded forming elevations called gyri with depressions between them termed as sulci that increase its surface area.
Question 39
Each cerebral hemisphere is divisible into_____ lobes
A
2
B
3
C
4
D
5
Question 39 Explanation: 
Each cerebral hemisphere is divisible into four lobes: a frontal lobe, a parietal lobe, a temporal lobe and an occipital lobe. These lobes are also known as cerebral lobes and are associated with specific functions. Any damage in specific lobe in-turn affects its function.
Question 40
The cerebrum is responsible for______
  1. Willpower
  2. Memory
  3. Thinking
  4. Imagination
A
2, 3
B
2, 4
C
1, 3, 4
D
All the above
Question 40 Explanation: 
The cerebrum is responsible for the thinking, intelligence, consciousness, memory, imagination, reasoning and willpower.
Question 41
_____ is a major conducting centre for sensory and motor signalling
A
Hypothalamus
B
Thalamus
C
Cerebrum
D
Cerebellum
Question 41 Explanation: 
Thalamus present in cerebral medulla is a major conducting centre for sensory and motor signalling. It acts as a relay centre.
Question 42
Which of the following statement about hypothalamus is correct?
  1. It lies at the base of the thalamus
  2. It controls sexual desire
A
1 alone
B
2 alone
C
1, 2
D
None
Question 42 Explanation: 
Hypothalamus lies at the base of the thalamus. It controls involuntary functions like hunger, thirst, sleep, sweating, sexual desire, anger, fear, water balance, blood pressure etc.
Question 43
_____ acts as the acts as a thermoregulatory centre of the body
A
Thalamus
B
Hypothalamus
C
Medulla Oblongata
D
Pons
Question 43 Explanation: 
Hypothalamus acts as a thermoregulatory (temperature control) centre of the body. It controls the secretion of hormones from anterior pituitary gland and is an important link between nervous system and endocrine system.
Question 44
Which of the following statement about midbrain is correct?
  1. It is located between thalamus and hind brain.
  2. It controls visual and auditory (hearing) reflexes
A
1 alone
B
2 alone
C
1, 2
D
None
Question 44 Explanation: 
Midbrain is located between thalamus and hind brain. The dorsal portion of the mid brain consists of four rounded bodies called corpora quadrigemina that control visual and auditory (hearing) reflexes.
Question 45
Hind Brain formed of___ parts
A
2
B
3
C
4
D
5
Question 45 Explanation: 
A human brain is formed of three main parts: (a) forebrain (b) midbrain and (c) hindbrain. Hindbrain is formed of three parts cerebellum, pons and medulla oblongata.
Question 46
Which of the following statement is correct?
  1. The human brain constitutes nearly 90 percent of fat
  2. EFAs cannot be synthesised and must be obtained from food.
  3. Fish, green leafy vegetables, almond, walnut are rich sources of EFAs
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 46 Explanation: 
The human brain constitutes nearly 60 percent of fat. The most crucial molecules that determine our brain’s integrity and the ability are Essential Fatty Acids (EFAs). EFAs cannot be synthesised and must be obtained from food. Fish, green leafy vegetables, almond, walnut are rich sources of EFAs.
Question 47
______is second largest part of the brain
A
Cerebrum
B
Cerebellum
C
Pons
D
Medulla Oblongata
Question 47 Explanation: 
Cerebellum is second largest part of the brain formed of two large sized hemispheres and middle vermis. It coordinates voluntary movements and also maintains body balance.
Question 48
Which of the following controls sleep cycle?
A
Cerebrum
B
Cerebellum
C
Pons
D
Medulla Oblongata
Question 48 Explanation: 
‘Pons’ a latin word meaning bridge. It is a bridge of nerve fibre that connects the lobes of cerebellum. It relays signals between the cerebellum, spinal cord, midbrain and cerebrum. It controls respiration and sleep cycle.
Question 49
Which of the following statement is correct?
  1. Medulla oblongata is the anterior most part of the brain that connects spinal cord and various parts of brain
  2. It also regulates vomiting and salivation.
  3. It has cardiac centres, respiratory centres, vasomotor centres to control heart beat
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 49 Explanation: 
Medulla oblongata is the posterior most part of the brain that connects spinal cord and various parts of brain. It has cardiac centres, respiratory centres, vasomotor centres to control heart-beat, respiration and contractions of blood vessels respectively. It also regulates vomiting and salivation.
Question 50
Match the following
  1. Cerebral cortex        1. Role in sleep-awake cycle
  2. Thalamus               2. Creativity
  3. Cerebellum         3. Acts as relay station
  4. Pons                       4. Maintenance of posture and balance
A
2, 1, 3, 4
B
2, 3, 4, 1
C
1, 3, 2, 4
D
3, 1, 4, 2
Question 51
Which of the following abnormalities can a EEG detect?
  1. Cardiac arrest
  2. Seizure
  3. Epilepsy
  4. Head Injury
A
1, 2, 4
B
2, 3, 4
C
1, 3, 4
D
All the above
Question 51 Explanation: 
Electroencephalogram (EEG) is an instrument which records the electrical impulses of brain. An EEG can detect abnormalities in the brain waves and help in diagnoses of seizures, epilepsy, brain tumor, head injuries, etc.
Question 52
Which of the following statement is correct?
  1. Spinal cord is a cylindrical structure lying in the neural canal of the vertebral column.
  2. It is also covered by meninges
A
1 alone
B
2 alone
C
1, 2
D
None
Question 52 Explanation: 
Spinal cord is a cylindrical structure lying in the neural canal of the vertebral column. It is also covered by meninges.
Question 53
Spinal Cord extends from the lower end of_____
A
Cerebrum
B
Cerebellum
C
Hypothalamus
D
Medulla Oblongata
Question 53 Explanation: 
Spinal cord extends from the lower end of medulla oblongata to the first lumbar vertebra. The posterior most region of spinal cord tapers into a thin fibrous thread like structure called filum terminal.
Question 54
The grey matter of spinal cord is___ shaped.
A
L
B
H
C
S
D
O
Question 54 Explanation: 
Internally, the spinal cord contains a cerebrospinal fluid filled cavity known as the central canal. The grey matter of spinal cord is ‘H’ shaped. The upper end of letter ‘H” forms posterior horns and lower end forms anterior horns.
Question 55
Which of the following statement about spinal cord is correct?
  1. A bundle of fibre pass into the posterior horn of Spinal cord forming dorsal or afferent root
  2. The white matter is external and have bundle of nerve tracts.
A
1 alone
B
2 alone
C
1, 2
D
None
Question 55 Explanation: 
The upper end of letter ‘H” forms posterior horns and lower end forms anterior horns. A bundle of fibre pass into the posterior horn forming dorsal or afferent root. Fibres pass outward from the anterior horn forming ventral or efferent root. These two root joins to form spinal nerves. The white matter is external and have bundle of nerve tracts
Question 56
Spinal cord conducts______ impulses to and from the brain.
  1. Motor
  2. Sensory
  3. Optical
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 56 Explanation: 
Spinal cord conducts sensory and motor impulses to and from the brain. It controls reflex actions of the body.
Question 57
Which of the following statement is incorrect?
  1. The brain is suspended in a special fluid environment called cerebrospinal fluid
  2. It is lymph like, watery fluid that surrounds and protects the brain within the skull
A
1 alone
B
2 alone
C
1, 2
D
None
Question 57 Explanation: 
The brain is suspended in a special fluid environment called cerebrospinal fluid (CSF). It is lymph like, watery fluid that surrounds and protects the brain within the skull. It also fills the central canal of the spinal cord.
Question 58
Which of the following are the functions of Cerebrospinal Fluid?
  1. It supplies nutrients from the brain
  2. It is also responsible for maintaining a constant pressure inside the cranium.
  3. It acts as shock absorbing fluid
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 58 Explanation: 
Functions of Cerebrospinal fluid: It acts as shock absorbing fluid and protects the brain from damage when it is subjected to sudden jerk. It supplies nutrients to the brain It collects and removes wastes from the brain. It is also responsible for maintaining a constant pressure inside the cranium.
Question 59
Which of the following statement is correct?
  1. A reflex is any response that occurs automatically with consciousness
  2. There are two types of reflexes.
A
1 alone
B
2 alone
C
1, 2
D
None
Question 59 Explanation: 
A reflex is any response that occurs automatically without consciousness. There are two types of reflexes. Simple or basic reflexes Acquired or conditioned reflexes
Question 60
Which of the following is not a Simple or basic reflex?
A
Yawning
B
Sneezing
C
Playing harmonium
D
Coughing
Question 60 Explanation: 
Simple or basic reflexes These reflexes are inbuilt and unlearned responses. Many of the actions we perform in our day to day life are simple reflexes. e.g., winking of eyes when any dust particles enter, sneezing, coughing, yawning, etc. We perform these actions without thinking
Question 61
Which of the following statement is correct about conditioned reflexes?
  1. These reflexes are the result of practice and learning
  2. Playing harmonium by striking a particular key on seeing a music note is an example of conditioned reflexes
A
1 alone
B
2 alone
C
1, 2
D
None
Question 61 Explanation: 
Acquired or conditioned reflexes are the result of practice and learning. Playing harmonium by striking a particular key on seeing a music note is an example of conditioned reflexes which required conscious training effort.
Question 62
Peripheral nervous system is formed by_________
  1. Nerves from brain
  2. Nerves from spinal cord
  3. Nerves from heart
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 62 Explanation: 
Peripheral nervous system is formed by the nerves arising from the brain and the spinal cord. The nerves arising from the brain are called cranial nerves. Nerves arising from spinal cord are called spinal nerves.
Question 63
In man, there are____ pairs of cranial nerves
A
11
B
31
C
12
D
24
Question 63 Explanation: 
In man, there are 12 pairs of cranial nerves. Some of the cranial nerves are sensory e.g. optic nerve which innervates the eye. Some are motor nerves which helps in rotation of eyeball. It also innervates the eye muscles, muscles of iris and tear gland.
Question 64
There are___ pairs of spinal nerves
A
31
B
13
C
12
D
24
Question 64 Explanation: 
There are 31 pairs of spinal nerves. Each spinal nerve has a dorsal sensory root and the ventral motor root. The direction of impulses in dorsal spinal root is towards the spinal cord and in ventral spinal root away from the spinal cord.
Question 65
__________ is also called as visceral nervous system
A
PNS
B
ANS
C
CNS
D
None
Question 65 Explanation: 
Autonomic nervous system (ANS) is also called as visceral nervous system as it regulates the function of internal visceral organs of our body through its two antagonistic (opposite) components sympathetic and parasympathetic systems.
Question 66
____ controls the involuntary functions of the visceral organs
A
PNS
B
ANS
C
CNS
D
None
Question 66 Explanation: 
Autonomic nervous system (ANS) enables the body to perform rapid and specific visceral activities in order to maintain steady state. It controls the involuntary functions of the visceral organs.
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