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Control And Coordination Mcq
Quiz 7
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Q.1
An inhibitory neurotransmitter is ... ..
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a) GABA
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b) Adrenaline
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c) Epinephrine
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d) Acetylcholine
Explanation
Answer : (a)
Q.2
Parkinson’s diseases¬(characterized by termors and progressive rigidity of limbs ) is due to degeneration of brain neurons involved in movement control and make use of neurotransmitter
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a) Acetylcholine
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b) Norepinphrine
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c) Dopamine
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d) GABA
Explanation
Neurons produce an important brain chemical known as dopamine, but when the neurons die or become impaired, they produce less dopamine. This shortage of dopamine causes the movement problems of people with Parkinson's. Answer : (c)
Q.3
Which is odd one? … [ MHTCET 2010]
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a) Arachnoid
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b) Duramater
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c) Piamater
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d) Choroid plexus
Explanation
Archnoid, Duramater, Piamater are layers of meninges While Choroid plexus is located in the ventricular system Answer : (d)
Q.4
Pacinian corpuscles are ...
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a) Glands
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b) Pain receptors
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c) Naked tactile receptors
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d) Encapsulated pressure receptors
Explanation
Pacinian corpuscles is Encapsulated pressure receptors, respond only to mechanical deformation. Answer : (d)
Q.5
Pigments present in cones of retina are connected with
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a) Night blindness
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b)Accommodation of eye
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c) Color discrimination
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d) Image formation
Explanation
The presence of multiple types of cone visual pigments enables color vision Answer : (c)
Q.6
In rabbit/mammal, the cranial nerve associated with the sense of body balance is
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a) IX
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b) VIII
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c) VII
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d) VI
Explanation
The vestibulocochlear nerve (auditory vestibular nerve), known as the eighth cranial nerve, transmits sound and equilibrium (balance) information from the inner ear to the brain. Answer : (b)
Q.7
Third , sixth and eleventh cranial nerves are
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a) Oculomotor, Abducens and Accessory Spinal
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b) Oculomotor, Trigeminal and Accessory Spinal
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c) Optic , Facial and Accessory Spinal
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d) Trochlear, Abducens and Vagus
Explanation
Third , sixth and eleventh cranial nerves are Oculomotor, Abducens and Accessory Spinal Answer : (a)
Q.8
An example of conditioned reflex is
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a) Withdrawal of hand on touching a hot surface
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b) Sneezing during cold
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c) Running indoor on arrival of rain
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d) Salivation in dog on seeing bread as found by Pavlov
Explanation
Conditioned reflex - an acquired response that is under the control of (conditional on the occurrence of) a stimulusconditioned reflex or an acquired response that is under the control of (conditional on the occurrence of) a stimulus. A learned response performed by a trained animal to a signal that was previously associated with an event of consequence for that animal. Answer : (d)
Q.9
Human eye is sensitive to light of wavelength
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a) 80 – 280 mm
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b) 280 – 380 mm
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c) 380 – 760 mm
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d) 760 – 880 mm
Explanation
380-760 nm is the wavelength range of visible spectrum. Human eyes are sensitive to this range. Answer : (c)
Q.10
In hypothalamus are located various centres of
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a) Metabolism
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b) Circulation
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c) Respiration
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d) Excretion
Explanation
The hypothalamus is responsible for the regulation of certain metabolic processes and other activities of the autonomic nervous system Answer : (a)
Q.11
Sympathetic nervous system is also called
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a) Visceral
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b) Thoracic- lumbar
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c) Cranio-sacral
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d) Mesenteric
Explanation
Sympathetic nerves arise from near the middle of the spinal cord in the intermediolateral nucleus of the lateral grey column, beginning at the first thoracic vertebra of the vertebral column and are thought to extend to the second or third lumbar vertebra Answer : (b)
Q.12
Conjunctive of eye is derived from
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a) Mesoderm
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b) Ectoderm
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c) Endoderm
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d) Endomesoderm
Explanation
Eye is formed from: 1) Ectoderm a) Ectoderm of neural tube → retina, optic nerve fibers, iris. b) Surface ectoderm → corneal and conjunctival epithelium, lens, lacrimal and tarsal glands. 2) Mesenchyme → corneal stroma, sclera, choroid, iris, ciliary muscle, parts of vitreous, muscles lining anterior chamber. Answer : (b)
Q.13
Iodopsin occurs in
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a) Iris
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b) Rods
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c) Cones
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d) Lens
Explanation
iodopsin a photosensitive violet pigment that occurs in the cones of the retina and is transformed by light into retinal and an opsin protein Answer : (c)
Q.14
Respiration, heart beat and peristalsis are controlled by
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a) Medulla oblongata
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b) Medulla oblongata and cerebrum
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c) Medulla oblongata and cerebellum
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d) Cerebellum
Explanation
The medulla oblongata helps regulate breathing, heart and blood vessel function, digestion, sneezing, and swallowing. This part of the brain is a center for respiration and circulation. Sensory and motor neurons (nerve cells) from the forebrain and midbrain travel through the medulla. The process of peristalsis is controlled by the medulla oblongata. Esophageal peristalsis is typically assessed by performing an esophageal motility study. Answer : (a)
Q.15
Cell bodies of motor nerve fibres occur in
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a) Dorsal root of spinal nerve
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b) Dorsal born of spinal cord
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c) Ventral-lateral horn of spinal cord
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d) Ventral root of spinal cord
Explanation
General rules of spinal cord organization are (1) that neurons and axons that process and relay sensory information are found dorsally; (2) that preganglionic visceral motor neurons are found in an intermediate/lateral region; and (3) that somatic motor neurons and axons are found in the ventral portion of the cord. Answer : (c)
Q.16
Which part of nervous system is activated under stress
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a) Whole autonomous nervous system
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b) Parasympathetic nervous system
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c) Sympathetic nervous system
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d) Spinal cord
Explanation
Stress is due to danger , body requires more energy to come out of danger or situation The sympathetic nervous system controls the body's automatic response to danger, increasing the heart rate, dilating the blood vessels, slowing digestion, and moving blood flow to the heart, muscles, and brain Answer : (c)
Q.17
In resting nerve what is true
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a) 3Na+ are pumped in and 2 K+ pumped out
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b) 3Na+ are pumped out for every 2K+ pumped in
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c) There is no Na-K pump
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d) Na- K pump stops working
Explanation
Membrane potential of resting neuron have 3 factors a) membrane proteins called sodium/potassium pumps activey pump 3 Na+ out and 2 K+ into cell b) large quantities of negatively charged protein molecules inside the cell cannot leak outside c) the membrane being permeable to K+ but impermeable to Na+. =Na+/K+ pump ensures that more potassium on inside than outside. simple diffusion K+ leaks out. Diffusion contributes to resting potential (b/c they are positive charged). Answer : (b)
Q.18
Common feature amongst acetylcholine, noradrenaline and serotonin is
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a) All are anticoagulants
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b) They lower blood pressure
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c) They raise heart beat
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d) All are neurotransmitters
Explanation
acetylcholine, noradrenaline and serotonin are eurotransmitters Answer : (d)
Q.19
The sense of equilibrium is determined by
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a) Basilar membrane of cochlea
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b) Tectorial membrane of cochlea
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c) Sensory crista of ampulla
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d) Sensory cells of organ of corti
Explanation
They are found in the ampullae of each of the semicircular canals of the inner ear, The function of the crista ampullaris is to sense angular acceleration and deceleration. Answer : (c)
Q.20
Maximum refraction of light occurs at
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a) Cornea
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b) Lens
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c) Iris
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d) Aqueous humor
Explanation
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. The cornea, with the anterior chamber and lens, refracts light, with the cornea accounting for approximately two-thirds of the eye's total optical power. In humans, the refractive power of the cornea is approximately 43 dioptres. While the cornea contributes most of the eye's focusing power, its focus is fixed. Answer : (a)
Q.21
Appetite and satiety centres of brain are present in
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a) Cerebral hemisphere
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b) Hypothalamus
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c) Cerebellum
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d) Medulla oblongata
Explanation
The hypothalamus acts as the control center for hunger and satiety. Part of the hypothalamus, the arcuate nucleus (or, in humans, the infundibular nucleus), allows entry through the blood-brain barrier of peripheral peptides and proteins that directly interact with its neurons. Answer : (b)
Q.22
Organ of Corti is connected with the sense of
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a) Taste
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b) Smell
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c) Hearing
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d) Equilibrium
Explanation
The organ of Corti is the sensitive element in the inner ear and can be thought of as the body's microphone. Answer : (c)
Q.23
The nature of nerve impulse is
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a) Physical
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b) Chemical
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c) Electrochemical
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d) Biophysical
Explanation
Nerve impulses are mostly electrical signals along the dendrites to produce a nerve impulse or action potential. The action potential is the result of ions moving in and out of the cell A nerve impulse is an electrical signal that travels along an axon. The nature of nerve impulse is Electrochemical Answer : (c)
Q.24
Acetylcholine is
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a) Toxin
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b) Vitamin
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c) Enzyme
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d) Chemical transmitter
Explanation
Acetylcholine (ACh) is an organic chemical that functions in the brain and body of many types of animals, including humans, as a neurotransmitter Answer : (d)
Q.25
Assertion Myelin sheath insulates nerve fibre and prevents its depolarization Reason : Nerve impulses are conduced more rapidly in non-myelinated fibres than myelinated ones ….[ AIIMS 2012]
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
The main purpose of a myelin layer is to increase the speed at which impulses propagate along the myelinated fiber. Answer : (d)
Q.26
Subarachnoid space occurs
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a) Above piamater
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b) Above duramater
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c) Inside blastocoels
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d) None of the above
Explanation
Subarachnoid space between the arachnoid membrane and pia mater that is filled with cerebrospinal fluid and contains the large blood vessels that supply the brain and spinal cord. Answer : (a)
Q.27
Primary function of myelin sheath around vertebrate axon is to …. [ Manipur 2006]
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a) Regulate Na-K pump
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b) Increase in size of action potential
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c) Increase in speed of conduction by preventing leakage of nerve impulse
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d) Deactivate he release of neurotransmitter
Explanation
Primary function of myelin sheath around vertebrate axon is toincrease in speed of conduction by preventing leakage of nerve impulse Answer : (c)
Q.28
Medulla oblongata contains centres which control … [ HPPMT 2010]
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a) Respiration
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b) Cardiovascular reflexes
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c) Gastric secretions
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d) All the above
Explanation
Autonomic centers for regulation of visceral function cardiovascular, respiratory, and digestive system activities. medulla oblongata controls the function of your autonomous nervous system, Answer : (d)
Q.29
Outer most covering of brain is
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a) Piamater
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b) Duramater
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c) Choroid
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d) Arachnoid
Explanation
Outer most covering of brain is Duramater Answer : (b)
Q.30
Which one does not involve brain ?
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a) Spinal reflex
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b) Cerebral reflex
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c) Cranial reflex
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d) Voluntary action
Explanation
Reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain. Answer : (a)
Q.31
Which is not a reflex action … …[ BHU 2012]
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a) Blinking of eyes
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b) Sweating
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c) Salivation
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d) Withdrawing of hand on touching some hot object
Explanation
Elevated body or environmental temperatures are the primary cause of increased sweating. Answer : (b)
Q.32
Touch on the right side stimulate neurons on
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a) Right somatic sensory area
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b) Right somatic motor area
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c) Left somatic sensory area
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d) Both b. and c.
Explanation
All fibers cross left becomes right in the medulla. Thus Touch on the right side stimulate neurons on left somatic sensory area Answer : (c)
Q.33
Nerve impulse for hearing originates in
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a) Ear drum
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b) Auditory nerve
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c) Ear ossicles
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d) Cochlea
Explanation
The organ of Corti is the sensitive element in the inner ear and can be thought of as the body's microphone. Vestibulocochlear nerve in the human ear, Eighth Cranial,Nerveserving the organs of hearing. Answer : (d)
Q.34
Injury to vagus nerve will not affect
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a) Gastrointestinal movements
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b) Tongue movements
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c) Cardiac movements
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d) Pancreatic secretion
Explanation
Vagus nerve transmit impulses to muscles associated with speech, swallowing, the heart, smooth muscles of visceral organs in the thorax, and abdomen. Answer : (b)
Q.35
Node of Ranvier occurs where
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a) Nerve is covered with myelin sheath
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b) Neurilemma is discontinuous
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c) Neurilemma and myelin sheath are discontinuous
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d) Myelin sheath is discontinuous
Explanation
Answer : (d)
Q.36
Neuromotor transmitter between two nerves at s synapse is
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a) Acetylcholine
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b) Sympathin
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c) ATP
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d) Insulin
Explanation
Neuromotor transmitter between two nerves at synapse is Acetylcholine Answer : (a)
Q.37
Hypothalamus is not involved in … [ KCET 2012]
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a) Osmoregulation and thirst
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b) Temperature control
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c) Accuracy of muscular movement
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d) Sleep wake cycle
Explanation
Cerebellum coordinates voluntary movements such as posture, balance, coordination, and speech, resulting in smooth and balanced muscular activity. Answer : (c)
Q.38
Indicate the correct match .. … [ Manipur 2007]
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a) IV cranial nerve – Optic
0%
b) VI cranial nerve – Auditory
0%
c) VIII carnial nerve – Vagus
0%
d) X cranial nerve - Vagus
Explanation
The vagus nerve is the 10th cranial nerve Answer : (d)
Q.39
At resting stage nerve cell has
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a) Low K+ Outside and high Na+ inside
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b) High K+ inside and high Na+ outside
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c) High K+ inside and low Na+ outside
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d) High K+ outside and low Na+ inside
Explanation
b) large quantities of negatively charged protein molecules inside the cell cannot leak outside. c) the membrane being permeable to K+ but impermeable to Na+. =Na+/K+ pump ensures that more potassium on inside than outside. simple diffusion KA+ leaks out. Diffusion contributes to resting potential (b/c they are positive charged). Answer : (b)
Q.40
Cornea and lens of eye are
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a) Transparent and help in image formation on retina
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b) Transparent and diverge light rays on retina for image formation
0%
c) Sensitive and richly supplied by nerves
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d) Sensitive and richly supplied by blood vessels
Explanation
Cornea and lens of eye are transparent and help in image formation on retina Answer : (a)
Q.41
The process that occur during repolarisation of nerve fibres are (i) Open Na+ channels (ii) Closed Na+ channels (iii) Closed K+ channels (iv) Open K+ channels
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a) (ii) and (iii)
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b) (i) and (iii)
0%
c) (ii) and (iv)
0%
d) (i) and (iii)
Explanation
After a cell has been depolarized, it undergoes one final change in internal charge. Following depolarization, the voltage-gated sodium ion channels that had been open while the cell was undergoing depolarization close again. The increased positive charge within the cell now causes the potassium channels to open. Potassium ions (K+) begin to move down the electrochemical gradient (in favor of the concentration gradient and the newly established electrical gradient). As potassium moves out of the cell the potential within the cell decreases and approaches its resting potential once more. The sodium potassium pump works continuously throughout this proces Answer : (c)
Q.42
Preganglionic sympathetic fibres are
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a) Andrenergic
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b) Cholinergic
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c) Hypergonic
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d) Synergic
Explanation
A receptor is cholinergic if it uses acetylcholine as its neurotransmitter. All preganglionic fibers, whether they are in the sympathetic division or in the parasympathetic division, are cholinergic that is, these fibers use acetylcholine as their neurotransmitter Answer : (b)
Q.43
Pre-excitation potential difference between outside and inside of a nerve is called
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a) Reaction potential
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b) Action potential
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c) Spike potential
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d) Resting potential
Explanation
The electrical potential difference across the resting plasma membrane is called a resting potential. Answer : (d)
Q.44
Cardiac centre occurs in … [ MHTCET 2009]
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a) Hypothalamus
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b) Cerebrum
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c) Medulla oblongata
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d) Cerebellum
Explanation
Medulla oblongata have autonomic centers for regulation of visceral function cardiovascular, respiratory, and digestive system activities. Answer : (c)
Q.45
In a medullated nerve fibre, conduction of impulse is faster due to … ..[ Odisha 2010]
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a) Pericytes
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b) Endoneurium anad epineurium
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c) Myelin sheath and nodes of Ranvier
0%
d) Nissl granules
Explanation
Myelin sheath prevents leakage of nerve impulse Nodes of Ranvier: The action potential propagated by one node of Ranvier jumps to and is regenerated at the next node along the axon, thereby enabling the action potential to travel rapidly along the fibre. Answer : (c)
Q.46
Myopia is corrected by
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a) Cylindrical lens
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b) Bifocal lens
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c) Biconvex lens
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d) Biconcave lens
Explanation
Shortsightedness is corrected using a concave (curved inwards) lens which is placed in front of amyopic eye Answer : (d)
Q.47
Proprioceptors are found in
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a) Sole of feet
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b) Adrenal cortex
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c) Hypothalamus
0%
d) Medulla
Explanation
Proprioceptors a sensory receptor which receives stimuli from within the body, especially one that responds to position and movement. The proprioceptors are sensors that provide information about joint angle, muscle length, and muscle tension, which is integrated to give information about the position of the limb in space. Answer : (a)
Q.48
Eustachian tube connects
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a) External ear with middle ear
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b) External ear wit internal ear
0%
c) Middle ear with pharynx
0%
d) Middle ear with internal ear
Explanation
The Eustachian tube is a tube that links the nasopharynx to the middle ear. It functions are Mucus drainage and Pressure equalization Answer : (c)
Q.49
Hypothalamus does not controls
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a) Hunger and satiety
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b) Thermoregulation
0%
c) Libido
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d) Creative thinking and consciousness
Explanation
cerebral cortex is essential for memory, attention, awareness, thought, language and consciousness Answer : (d)
Q.50
Which one is used in balancing
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a) Organ of corti
0%
b) Vestibular region
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c) Middle ear
0%
d) Cochlea
Explanation
The vestibular system includes the parts of the inner ear and brain that process the sensory information involved with controlling balance and eye movements. Answer : (b)
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