Neural Control And Coordination — DPP 3

20 NEET questions from Neural Control And Coordination, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
Branched fibrous structures projecting out of the cell body that show presence of Nissl's granules are called
  1. A Axon
  2. B Cyton
  3. C Perikaryon
  4. D Dendrites
Show answer & explanation

Correct answer: D

Dendrites are short fibers, branched, contain Nissl's granules and project out of the cell body.
2
Paralysis of jaw muscles is due to loss of function of which cranial nerve?
  1. A III
  2. B V
  3. C VII
  4. D X
Show answer & explanation

Correct answer: B

The trigeminal nerve ( $\mathrm { V } ^ { \text {th } }$ nerve) controls the movement of jaw muscles. Loss of function of this nerve leads to paralysis of the former muscles.
3
The vomiting centre is situated in
  1. A Cerebrum
  2. B Cerebellum
  3. C Medulla
  4. D Hypothalamus
Show answer & explanation

Correct answer: C

Vomiting centre is located in the medulla oblongata.
4
Which part is involved in movement of head to locate and detect the source of a sound?
  1. A Superior colliculi
  2. B Inferior colliculi
  3. C Pons
  4. D Medulla oblongata
Show answer & explanation

Correct answer: B

Inferior colliculi is present inside the dorsal wall of the midbrain as the lower two round swellings. They receive impulse from ears and the muscles of head and control the auditory reflexes.
5
End of spinal cord is
  1. A Cauda equina
  2. B Conus terminalis
  3. C Filum terminalis
  4. D Funiculus
Show answer & explanation

Correct answer: B

End of the spinal cord is the conus terminalis.

Filum terminale $=$ Fibrous tissue derived from pia mater.

Cauda equina $=$ Number of parallel spinal nerves in hinder part of spinal cord.
6
Which of the following statements is incorrect w.r.t. knee jerk reflex?
  1. A Single synapse with interneurons between afferent and efferent pathway
  2. B Synapse formed is without interneurons between sensory and motor pathway
  3. C Synapse stimulates the contraction of quadricep muscle
  4. D Muscle spindle works as receptor in this monosynaptic reflex
Show answer & explanation

Correct answer: A

Knee-jerk reflex action is monosynaptic.

Single synapse is present without interneurons.
7
Short sightedness or myopic vision is corrected by wearing
  1. A Convex lenses
  2. B Concave lenses
  3. C Convex mirrors
  4. D Concave mirrors
Show answer & explanation

Correct answer: B

Short sightedness or myopia in which the image is formed in front of the retina is corrected by wearing the diverging on concave lenses.
8
Overproduction of aqueous humour can result in
  1. A Astigmatism
  2. B Fovea centralis
  3. C Macula lutea or yellow spot
  4. D Glaucoma
Show answer & explanation

Correct answer: D

Glaucoma is caused by increased intraocular pressure (IOP) either due to increased secretion of aqueous humor or blockage of the drainage canal which causes damage to the optic nerve.
9
A chemical synapse is formed by
  1. A Only synaptic cleft
  2. B Only presynaptic membrane and synaptic knob
  3. C Connection through gap junctions between presynaptic knob and postsynaptic membrane
  4. D Presynaptic membrane, synaptic cleft and postsynaptic membrane
Show answer & explanation

Correct answer: D

Synapse is a junction between two neurons through which the nerve impulse is transmitted from one neuron to another. Chemical synapse includes presynaptic membrane, postsynaptic membrane and a space between the two membranes called synaptic cleft.
10
"The two hemispheres are connected by a tract of nerve fibres called corpus callosum". This is true for
  1. A Round swellings in mid brain
  2. B Cerebellum
  3. C Cerebrum
  4. D Medulla
Show answer & explanation

Correct answer: C

Cerebral hemispheres are connected by corpus callosum. Round swellings in midbrain form corpora quadrigemina. Cerebellum is also divided into two hemispheres.
11
In old age, the vision of eye becomes dim due to deposits on lens, the condition is called
  1. A Myopia
  2. B Hypermetropia
  3. C Cataract
  4. D Astigmatism
Show answer & explanation

Correct answer: C

Cataract is a condition, more prevalent in old ages which is due to increase in the opacity of the lenses

Myopia : Eyeball is anterio-posteriorly elongated (Short sightedness)

Hypermetropia : Eyeball is anterio-posteriorly shortened (Farsighted)

Astigmatism : This disorder is due to rough curvature of cornea or lens

Cataract is the most common cause of vision loss in people over age 40 and is a principal cause of blindness in the world.
12
Hypothalamus does not primarily work as centre for regulation of
  1. A Thirst
  2. B Respiratory rhythm
  3. C Hunger
  4. D Body temperature
Show answer & explanation

Correct answer: B

Medulla is responsible for setting respiratory rhythm. Thirst, hunger, satiety and body temperature are regulated by hypothalamus.
13
In Presbyopia
  1. A The eye ball becomes short
  2. B The lens become opaque
  3. C The retina gets damaged
  4. D Diminution of accommodation of lens due to loss of elasticity
Show answer & explanation

Correct answer: D

Presbyopia is a defect in the eyes of old age people due to loss of elasticity of lens and reduced power of accommodation. Age related changes occur within the protein in the lens, making the lens harder and less elastic over time. Age related changes also taken place in the muscle fibres surrounding the lens.
14
The activity of which cranial nerve can protect us by warning about harmful chemicals in the air?
  1. A V
  2. B IX
  3. C VI
  4. D X
Show answer & explanation

Correct answer: A

V. Trigeminal nerve - Smell (associated with nose)

IX. Glossopharyngeal - Taste and touch movements of Pharynx

VI. Abducens - Rotation of eyeball

X. Vagus nerve - Swallowing

Thus, activity of trigeminal nerve protects us by warning about harmful chemicals in the air.
15
Depolarisation of neural membranes is caused due to
  1. A Rapid influx of $\mathrm { Na } ^ { + }$ions
  2. B Rapid influx of $\mathrm { K } ^ { + }$ions
  3. C Rapid efflux of $\mathrm { Na } ^ { + }$ions
  4. D Rapid influx of $\mathrm { Cl } ^ { - }$ions
Show answer & explanation

Correct answer: A

On arrival of stimulus at a site on the polarised neural membrane, the membrane becomes freely permeable to $\mathrm { Na } ^ { + }$and there is rapid influx of $\mathrm { Na } ^ { + }$ions through the voltage gated $\mathrm { Na } ^ { + }$channels causing depolarisation.
16
The corpuscles lying deep in dermis and responsible for deep pressure are known as
  1. A Pacinian corpuscles
  2. B Meissner's corpuscles
  3. C Merkel's discs
  4. D Ruffini's endings
Show answer & explanation

Correct answer: A

Pacinian corpuscles are present deep in the dermis and responsible for deep pressure.

Meissner's corpuscles - Gentle pressure

Merkel's discs - Touch

Ruffini's endings - Heat
17
An essential part of human ear which has no role in hearing is
  1. A Vestibular apparatus
  2. B Ear ossicles
  3. C Tectorial membrane
  4. D Organ of Corti
Show answer & explanation

Correct answer: A

Vestibular part of ear is involved in maintaining balance.

Ear ossicles: Middle ear contains 3 bones called ear ossicles acting as a lever system which amplify the sound vibration.

Organ of Corti: It is a structure which contains hair cells that act as auditory receptors and are involved in mechanism of hearing.
18
Choroid layer forms ciliary body in the $\underline{\mathrm{A}}$ portion of eye and is thin over the B portion of eye ball.
Choose the option which fills the blank correctly.
  1. A
  2. B
  3. C
  4. D
Show answer & explanation

Correct answer: A

Ciliary body is formed by choroid layer at the anterior part of eye and their layer is thin over the posterior two third part of eye.
19
A major coordinating centre for sensory and motor signaling that is wrapped by the cerebrum is
  1. A Thalamus
  2. B Hypothalamus
  3. C Epithalamus
  4. D Cerebellum
Show answer & explanation

Correct answer: A

Thalamus is a part of forebrain.
20
The components of the vestibular apparatus are
  1. A Three semicircular canals and the otolithic organs
  2. B Organ of Corti and Eustachian tube
  3. C Malleus, incus and stapes
  4. D Saccule and cochlea
Show answer & explanation

Correct answer: A

Vestibular apparatus is comprised of three circular canals and otolith organs.

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