MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
NEET Biology MCQ
Control And Coordination Mcq
Quiz 6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Q.1
Common neurotransmitter of peripheral nervous system is
0%
a) Colcohicine
0%
b) Epinephrine
0%
c) GABA
0%
d) Acetylcholine
Explanation
In the peripheral nervous system, acetylcholine activates muscles, and is a major neurotransmitter in the autonomic nervous system. Neurons in every region of the brain use GABA to fine-tune neurotransmission Answer : (d)
Q.2
Cranial nerves found in man and frog are respectively
0%
a) 12 and 10
0%
b) 10 and 12
0%
c) 10 and 13
0%
d) 11 and 12
Explanation
12 Cranial nerves found in man Frogs have ten pairs of cranial nerves. Answer : (a)
Q.3
Eye ball is moved in the orbit by
0%
a) Four rectus and two oblique muscles
0%
b) Ciliary muscles
0%
c) Suspensory ligaments and ciliary muscles
0%
d) Three circular ad four oblique muscles
Explanation
Within the orbit, the eye is suspended by six extraocular muscles (four rectus muscles and two oblique muscles), suspensory ligaments, and surrounding orbital fat. Answer : (a)
Q.4
Saltatory transmission occurs in
0%
a) Nonmyelinated nerve fibre
0%
b) Myelinated nerve fibre
0%
c) Both
0%
d) None of the above
Explanation
Saltatory conduction is the propagation of action potentials along myelinated axons from one node of Ranvier to the next node, increasing the conduction velocity of action potentials. The main purpose of myelin is to increase the speed at which electrical impulses propagate along the myelinated fiber.myelinated fibers, propagate by saltatory conduction. Saltatory transmission occurs at the Node of Ranvier Answer : (b)
Q.5
Neurotransmitter between neuron and a muscle cell is
0%
a) Dopamine
0%
b) Serotonin
0%
c) Endorphin
0%
d) Acetylcholine
Explanation
Motor neurons causes action in muscle cells The interface between a motor neuron and muscle fiber is a specialized synapse called the neuromuscular junction. Upon adequate stimulation, the motor neuron releases a flood of Acetylcholine that bind to postsynaptic receptors and triggers a response in the muscle fiber which leads to muscle movement. Answer : (d)
Q.6
Action potential of a nerve cell is
0%
a) -60 mv
0%
b) -80 mv
0%
c) +20 mv
0%
d) +60 mv
Explanation
Action potential of a nerve cell is + 20 mv. Answer : (c)
Q.7
Motor neuron of reflex arc carries impulse from … [ CET Chd 2006]
0%
a) Receptor to central nervous system
0%
b) Central nervous system of effectors
0%
c) Central nervous system to receptors
0%
d) Effectors to central nervous system
Explanation
A motor neuron carries the message from the central nervous system to the effector. Answer : (b)
Q.8
Broca’s area and Wernicke centre of association area occur in cerebrum. They are connected with
0%
a) Memory
0%
b)Voluntary
0%
c) Blind spot
0%
d) Both a. and b.
Explanation
Broca's area is connected to another brain region known as Wernicke's area. Wernicke's area is associated with processing and understanding language. Memory is required for word and grammar and experience. Articulation is due to voluntary muscles present in larynx and the pharyngeal, oral, and nasal cavities, tongue, the upper lip, the lower lip Answer : (d)
Q.9
Parasympathetic nerve endings release
0%
a) Adrenaline
0%
b) GABA
0%
c) Acetylcholine
0%
d) Noradrenaline
Explanation
Parasympathetic nerve endings release Acetylcholine Answer : (c)
Q.10
In myopia or short sightedness
0%
a) Image is formed slightly in front of retina because eye ball is longer
0%
b) Eye ball is normal but image is formed over blind spot
0%
c) Eye ball is normal but images is formed slightly behind the retina due to faulty lens
0%
d) Curvature of cornea becomes irregular
Explanation
Answer : (a)
Q.11
Temporal lobe does not contain …[ MHTCET 2010]
0%
a) Wernicke's area
0%
b) Olfactory area
0%
c) Auditory area
0%
d) Broca’s area
Explanation
Broca's area is a region in the frontal lobe of the dominant hemisphere (usually the left) of the hominid brainwith functions linked to speech production Answer : (d)
Q.12
Centre for sense of smell is
0%
a) Cerebellum
0%
b) Olfactory lobes
0%
c) Cerebrum
0%
d) Midbrain
Explanation
The olfactory lobe, or olfactory bulb, is the structure within the brain that receives neural input from the nasal cavity, thus processing the sense of smell. Answer : (b)
Q.13
Memory centre is present in
0%
a) Cerebellum
0%
b) Parietal lobe
0%
c) Temporal lobe
0%
d) Occipital lobe
Explanation
The temporal lobes are involved in several functions of the body including: Auditory Perception, Memory, Speech,Language Comprehension, Emotional Responses Visual Perception, Facial Recognition Answer : (c)
Q.14
The defective condition of eye in which distant objects are seen distinct but near objects are indistinct is called
0%
a) Myopia
0%
b) Astigmatism
0%
c) Presbyopia
0%
d) Hypermetropia
Explanation
Answer : (d)
Q.15
Which is absent in aqueous humor
0%
a) Carbon dioxide
0%
b) Oxygen
0%
c) Hyaluronic acid
0%
d) Glucose
Explanation
The aqueous humour is a transparent, watery fluid similar to plasma, but containing low protein concentrations. Hyaluronic acid is present in aqueous humor. Hyaluronic acid, also called hyaluronan, is an anionic, nonsulfated glycosaminoglycan distributed widely throughout connective, epithelial, and neural tissues. Answer : (c)
Q.16
Amount of CSF in cranial cavities is … ..[ WB 2011]
0%
a) 500 ml
0%
b) 150 ml
0%
c) 1 itre
0%
d) 1.5 ml
Explanation
TThe total volume of CSF in the adult ranges from 140 to 270 ml Answer : (b)
Q.17
Eye focused on distant object would have
0%
a) Relaxed ciliary muscles and taut suspensory ligament
0%
b) Taut suspensory ligament and rounded lens
0%
c) Contracted ciliary muscles and relaxed suspensory ligaments
0%
d) Contracted ciliary muscles and rounded lens
Explanation
Relaxation of the ciliary muscle causes the zonular fibers to become taut, flattening the lens, increasing the focal distance and object distant object can be seen clearly. Reverse happens when we see nearby object Answer : (a)
Q.18
Depression in retina which has cones only is
0%
a) Blind spot
0%
b) Fenestra rotunda
0%
c) Fovea centralis
0%
d) Fenestra ovalis
Explanation
Fovea centrailsis a small depression in the retina of the eye where clarity of vision is highest. where retinal cones are particularly concentrated. Answer : (c)
Q.19
Ventral root of spinal nerve is composed of
0%
a) Somatic motor and visceral sensory fibres
0%
b) Somatic sensory and visceral sensory fibres
0%
c) Somatic motor and visceral motor fibres
0%
d) Somatic sensory and visceral motor fibres
Explanation
The ventral roots are composed, predominantly, of efferent somatic motor fibers. Answer : (c)
Q.20
Muller’s fibers occur in ..
0%
a) Heart
0%
b) Kidney
0%
c) Pancreas
0%
d) Retina
Explanation
Muller’s fibers are living optical fibers in the vertebrate retinawhich serve as support cells for the neurons of the retina Answer : (d)
Q.21
Which of the following is the tenth cranial nerve?
0%
a) Pneumogastric
0%
b) Glossopharyngeal
0%
c) Trochlear
0%
d) Tri geminal
Explanation
Cranial Nerve
Name
Function
I
The Olfactory Nerve
Sense of Smell
II
The Optic Nerve
Vision
III
The Oculomotor Nerve
Raise eyelids, move eyes, regulate the size of pupils, focus of lenses.
IV
The Trochlear Nerve
Eye movements, proprioception
V
The Trigeminal Nerve
Sensations of the head and face, chewing movements, and muscle sense.
VI
The Abducent Nerve
Produce movements of the eyes
VII
The Facial Nerve
Facial expressions, secretion of saliva, taste.
VIII
The Vestibulocochlear Nerve
Balance or equilibrium sense. Hearing.
IX
The Glossopharyngeal Nerve
Taste and other sensations of tongue, swallowing, secretion of saliva, aid in reflex control of blood pressure and respiration.
X
The Vagus Nervehistorically cited as the pneumogastric nerve
Transmit impulses to muscles associated with speech, swallowing, the heart, smooth muscles of visceral organs in the thorax, and abdomen.
XI
Accessory nerve
Turning movements of the head, movements of the shoulder and viscera, voice production.
XII
Hypoglossal
Tongue movements
Answer : (a)
Q.22
Dorsal root ganglion is ....
0%
a) Motor
0%
b) Mixed
0%
c) Sensory
0%
d) None of the above
Explanation
The dorsal root ganglia contain the cell bodies of sensory neurons Answer : (c)
Q.23
Middle ear has ...
0%
a) Two sets of tiny bones
0%
b) Three sets of tiny bones
0%
c) Two sets of large bones
0%
d) Three sets of large bones
Explanation
The middle ear contains three tiny bones, called the ossicles. These three bones form a connection from the eardrum to the inner ear. As sound waves hit the eardrum, the eardrum moves back and forth causing the ossicles to move. As a result, the sound wave is changed to a mechanical vibration. Answer : (b)
Q.24
Body coordination is maintained by ...
0%
a) Circulatory system
0%
b) Nervous system
0%
c) Endocrine system
0%
d) Both b. and c.
Explanation
Body coordination is maintained by Nervous system and Endocrine system Answer : (b)
Q.25
Myelin sheath occurs in .... Answer : (d)
0%
a) Unipolar neuron
0%
b) Bipolar neuron
0%
c) Non – medullated neuron
0%
d) Medullated nerve fibre
Explanation
Medullated nerve fiber - a nerve fiber encased in a sheath of myelin Answer : (d)
Q.26
Nerve related to diaphragm is
0%
a) Vagus
0%
b) Phrenic
0%
c) Trigeminal
0%
d) Glossopharyngeal
Explanation
The phrenic nerve is a nerve that originates in the neck (C3-C5) and passes down between the lung and heart to reach the diaphragm. Answer : (b)
Q.27
Nerve depolarization is maintained by ...
0%
a) Ca2+
0%
b) Mg2+
0%
c) K+
0%
d) Cl-
Explanation
depolarization is a change within a cell, during which the cell undergoes a shift in electric charge distribution, resulting in less negative charge inside the cell. the sodium ions rush back into the cell, they add positive charge to the cell interior, and change the membrane potential from negative to positive. Answer : (c)
Q.28
Color blindness is due to defect in ...
0%
a) Cones
0%
b) Rods
0%
c) Rods and cones
0%
d) None of these
Explanation
Color blindness occurs when one or more types of cones are either totally absent, or has a limited spectral sensitivity. Answer : (a)
Q.29
A frog with crushed brain is pinched on the leg is drawn away. It is ...
0%
a) Automatic motor response
0%
b) Neurotransmitter induced response
0%
c) Conditional reflex
0%
d) Simple reflex
Explanation
A reflex arc is the nerve pathway which makes such a fast, automatic response possible. without the delay of routing signals through the brain. Answer : (d)
Q.30
Motor nerve is ...
0%
a) Olfactory
0%
b) Optic
0%
c) Oculomotor
0%
d) Vagus
Explanation
The Oculomotor NerveRaise eyelids, move eyes, regulate the size of pupils, focus of lenses. Olfactory and optic nerve have sensory nerve. While Vagus have both motor and sensory nerve.It is the longest nerve of the autonomic nervous system in the human body. Answer : (c)
Q.31
Part of brain controlling balance and coordination is ...
0%
a) Cerebrum
0%
b) Medulla oblongata
0%
c) Hypothalamus
0%
d) Cerebellum
Explanation
Cerebellum part of brain controlling balance and coordination Answer : (d)
Q.32
Ivan Pavlov performed experiments on ...
0%
a) Simple reflexes
0%
b) Conditioned reflexes
0%
c) Cardiac reflexes
0%
d) Origin of life
Explanation
Conditioned reflexes is a learned response performed by a trained animal to a signal that was previously associated with an event of consequence for that animal. Conditioned reflex (CR) was first used by the Russian physiologist I. P. Pavlov Answer : (b)
Q.33
Under prolonged starvation , brain receives energy from ...
0%
a) Carbohydrates
0%
b) Fats
0%
c) Proteins
0%
d) Acetoacetate
Explanation
During starvation the body does everything possible to preserve the brain. After 2 or 3 days of fasting, the liver begins to synthesize ketone bodies from precursors obtained from fatty acid breakdown. The brain uses these ketone bodies as fuel, thus cutting its requirement for glucose. After several days of fasting, all cells in the body begin to break down protein. This releases amino acids into the bloodstream, which can be converted into glucose by the liver Since much of our muscle mass is protein, this phenomenon is responsible for the wasting away of muscle mass seen in starvation. Answer : (c)
Q.34
Part of eye controlling amount of light entering is ....
0%
a) Iris
0%
b) Cornea
0%
c) Ciliary body
0%
d) Suspensory ligament
Explanation
Iris control the amount of light entering the eye through the pupil. Answer : (a)
Q.35
Occipital lobe is connected with …. [ MHTCET 2007]
0%
a) Smell
0%
b) Vision
0%
c) Hearing
0%
d) Speech
Explanation
The occipital lobe is the visual processing area of the brain. It is associated with visuospatial processing, distance and depth perception, color determination, object and face recognition, and memory formation. Answer : (b)
Q.36
Cerebrum is in contact with … ..[ MHT CET 2011]
0%
a) Duramater
0%
b) Arachnoid
0%
c) Piamater
0%
d) Enterocoel
Explanation
Pia mater often referred to as simply the pia, is the delicate innermost layer of the meninges, the membranes surrounding the brain and spinal cord. Answer : (c)
Q.37
Assertion. No taste sensation occurs when drop of distilled water is put on tongue. Reason. Human does not have taste buds for water
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
No taste sensation is evoked when distilled water is put on human tongue because man does not possess taste buds for tasting water. The taste buds present on the tongue send nerve impulses to the brain which actually preceives the taste sensation. Some mammals such as rhesus monkeys, pigs, cats and dogs possess some taste buds which send nerve impulses to the brain when distilled water is applied on them. It seems, therefore, that water may stimulate these taste buds to evoke taste sensation in these animals. Answer : (a)
Q.38
Color perception in human is due to ...
0%
a) Rhodopsin pigment in rod cells
0%
b) Rhodopsin pigment in cone cells
0%
c) Iodopsin pigment in rod cells
0%
d) Iodopsin pigment in cone cells
Explanation
Iodopsinclass of light-sensitive pigments found in the retinal cones of the vertebrate eye. Rhodopsinpigment-containing sensory protein that converts light into an electrical signal. Answer : (d)
Q.39
An isolated neuron placed in Calcium free medium is given a suprathreshold stimulus. An assay on release of neurotransmitter shows …. .. [ JKCET 2002]
0%
a) No neurotransmitter as Ca influx is required for conduction of action potential
0%
b) Neurotransmitter detected due to suprathreshold stimulus and non-requirement of Ca
0%
c) No neurotransmitter is detected due to absence of Ca influx into synaptic knob
0%
d) No prediction possible without knowing whether the neuron was myelinated
Explanation
Calcium (Ca2+) is a vital element in the process of neurotransmitter release; when Ca2+ channels are blocked, neurotransmitter release is inhibited. Answer : (c)
Q.40
Alcohol affects ...
0%
a) Medulla oblongata
0%
b) Cerebellum
0%
c) Cerebral cortex
0%
d) Thalamus
Explanation
alcohol affects the cerebellum, muscle movements become uncoordinated. Answer : (b)
Q.41
Semicircular canals occur in ...
0%
a) Heart
0%
b) Kidney
0%
c) Intestine
0%
d) Ear
Explanation
Answer : (d)
Q.42
The processes that occur during repolarisation of nerve fibres are (i) Open Na+ channel (ii) Closed Na+ channels(ii) Closed K+ channels (iv) Open K+ channels …. [ Guj CET 2007]
0%
a) (ii) and (iii)
0%
b) (i) and (ii)
0%
c) (ii) and (iv)
0%
d) (i) and (iii)
Explanation
After the peak of action potential, called spike potential, the permeability ofthe membrane to Na+ decreases, while it becomes more permeable for K+ whichrapidly diffuses out from the cytoplasm to extracellular fluid due toelectrochemical gradient. Soon, this part of membrane regains its originalpolarity and becomes electropositive on outside and electronegative on inside.This is known as repolarization and the nerve fibre is called repolarized nerve Answer : (c)
Q.43
Vasomotor nerves are ...
0%
a) Sympathetic
0%
b) Parasympathetic
0%
c) Both a. and b.
0%
d) None of the above
Explanation
vasomotor nerve A motor nerve effecting dilation, such as a vasodilator nerve, orcontraction, such as a vasoconstrictor nerve, of the blood vessels. Answer : (a)
Q.44
Aqueous and vitreous humours are separated by
0%
a) Lens
0%
b) Iris
0%
c) Retina
0%
d) Optic nerve
Explanation
Answer : (a)
Q.45
Correct sequence of meninges of brain from outside to inside is ....
0%
a) Duramater-Piamater-Arachnoid
0%
b) Piamater- Duramater-Arachnoid
0%
c) Arachnoid-Duramater-Piamater
0%
d) Duramater-Arachnoid –Piamater
Explanation
Answer : (d)
Q.46
The correct pair of cervical nerves and cervical vertebrae is … [ Guj CET 2009]
0%
a) 7, 7
0%
b) 7, 16
0%
c) 8, 7
0%
d) 16,7
Explanation
Answer : (c)
Q.47
In resting stage of neuron , diffusion due to concentration gradient will drive ...
0%
a) K+ into cell
0%
b) K+ and Na+ out of cell
0%
c) Na+ into cell
0%
d) Na+ out of cell
Explanation
resting stage of neuron, sodium ions (Na+) are maintained at high concentrations outside of the cell, thus Na+ will diffuse in to the cell Answer : (c)
Q.48
In axon of a neuron, the impulse is generated by exchange of ...
0%
a) Sodium and chlorine
0%
b) Magnesium and chloride
0%
c) Calcium and potassium
0%
d) Sodium and potassium
Explanation
As an action potential (nerve impulse) travels down an axon there is a change in polarity across the membrane of the axon. In response to a signal from another neuron, sodium- (Na+) and potassium- (K+) gated ion channels open and close as the membrane reaches its threshold potential. Answer : (d)
Q.49
Hypoglossal nerve controls movement of ...
0%
a) Tongue
0%
b) Heart
0%
c) Eye
0%
d) Ear
Explanation
The hypoglossal nerve provides motor control of the extrinsic muscles of the tongue. The hypoglossal nerve also supplies movements including clearing the mouth of saliva and other involuntary activities Answer : (a)
Q.50
Fish are able to see under water because ... ..
0%
a) Both the lens and cornea are special
0%
b) Cornea is spherical, lens is flat
0%
c) Cornea is flat, lens is spherical
0%
d) Both lens and cornea are flat
Explanation
Lens is spherical, to increase the refraction of light. This difference compensates for the smaller angle of refraction between the eye's cornea and the watery medium, Answer : (c)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page