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Zoology
Neural Control and Coordination
69 questions · Click an option and press Check Answer to reveal the result
1
The aperture surrounded by the iris is the:
A
Pupil
B
Lens
C
Fovea
D
Blind spot
2
The canal that passes through the midbrain is called:
A
Corpus callosum
B
Cerebral aqueduct
C
Central canal
D
Foramen of Monro
3
Photoreceptor cells of the retina are:
A
Rods and Cones
B
Bipolar cells
C
Ganglion cells
D
All of the above
4
The transmission of an impulse across a chemical synapse is accomplished by:
A
Direct flow of current
B
Neurotransmitters
C
Hormones
D
Lymph
5
Reflex action is controlled by:
A
Cerebrum
B
Cerebellum
C
Spinal cord
D
Hypothalamus
6
Which of the following are chemoreceptors?
A
Gustatory and Olfactory receptors
B
Photoreceptors and Phonoreceptors
C
Thermoreceptors and Statoreceptors
D
All of the above
7
The membrane potential of a resting neuron is mainly maintained by:
A
Active transport of Na⁺ and K⁺ ions
B
Diffusion of glucose
C
Movement of calcium only
D
Breakdown of proteins
8
Which of the following systems transmits impulse from CNS to involuntary organs and smooth muscles ?
A
Somatic neural system
B
Sympathetic neural system
C
Parasympathetic neural system
D
Autonomic neural system
9
The part of the brain that controls body temperature, urge for eating and drinking is:
A
Thalamus
B
Hypothalamus
C
Pons
D
Medulla
10
The outermost covering of the brain is:
A
Pia mater
B
Dura mater
C
Arachnoid mater
D
Grey matter
11
Brain stem includes
A
Cerebrum, Pons, Medulla oblongata
B
Mid brain, Pons, Cerebellum
C
Mid brain, Pons, Medulla oblongata
D
Thalamus, Pons, Medulla oblongata
12
The 'Blind spot' is the region where:
A
Optic nerves leave the eye
B
Retinal blood vessels enter the eye
C
Photoreceptor cells are absent
D
All of the above
13
Unmyelinated nerve fibers are commonly found in:
A
Autonomous and somatic neural systems
B
Spinal and cranial nerves
C
Only the Brain
D
Only the Spinal cord
14
Which ion is mainly responsible for depolarisation of a neuron during action potential?
A
K⁺
B
Na⁺
C
Ca²⁺
D
Cl⁻
15
Which structure connects the middle ear cavity with the pharynx?
A
Auditory canal
B
Eustachian tube
C
Cochlea
D
Semicircular canal
16
During the resting state of a neuron, the axonal membrane is:
A
Comparatively more permeable to K+ and nearly impermeable to Na+
B
Comparatively more permeable to Na+ and nearly impermeable to K+
C
Equally permeable to both Na+ and K+
D
Impermeable to both Na+ and K+
17
Which lobe of cerebrum is primarily responsible for vision?
A
Frontal lobe
B
Parietal lobe
C
Temporal lobe
D
Occipital lobe
18
Which part of the brain controls balance and posture?
A
Cerebrum
B
Cerebellum
C
Medulla oblongata
D
Hypothalamus
19
The four round swellings on the dorsal portion of the midbrain are:
A
Cerebral peduncles
B
Corpora quadrigemina
C
Thalamus
D
Cerebellum
20
Which of the following is a neurotransmitter?
A
Insulin
B
Adrenaline
C
Acetylcholine
D
Thyroxine
21
The ciliary body is a part of:
A
Sclera
B
Choroid
C
Retina
D
Iris
22
The wall of the eyeball is composed of three layers. The outer layer is:
A
Choroid
B
Retina
C
Sclera
D
Cornea
23
When a stimulus is applied to a site on the polarized membrane, the membrane becomes freely permeable to:
A
K+
B
Na+
C
Cl-
D
Ca2+
24
The fluid found inside the membranous labyrinth is:
A
Perilymph
B
Endolymph
C
Lymph
D
Hemolymph
25
Which part of the brain is called the "little brain" and is responsible for maintaining posture and balance?
A
Cerebrum
B
Cerebellum
C
Medulla
D
Pons
26
Which of the following is correctly matched?
A
Cerebellum — Regulation of heartbeat
B
Medulla oblongata — Maintenance of posture
C
Hypothalamus — Homeostasis
D
Cerebrum — Balance of body
27
The fluid-filled cavities of the brain are called:
A
Sulci
B
Gyri
C
Ventricles
D
Synapses
28
The 'Corpus callosum' connects:
A
Two cerebral hemispheres
B
Two lobes of cerebellum
C
Forebrain and Hindbrain
D
Spinal cord and Brain
29
The point of greatest visual acuity (resolution) in the retina is:
A
Blind spot
B
Fovea
C
Iris
D
Optic chiasma
30
Which part of the neuron receives nerve impulses?
A
Axon
B
Dendrite
C
Myelin sheath
D
Node of Ranvier
31
Assertion : Coordination is the process through which two or more organs interact and complement the functions of one another.
Reason : The functions of muscles, lungs, heart, blood vessels, kidney and other organs are coordinated while performing physical exercises.
A
Assertion and reason both are true and the reason is correct explanation of assertion.
B
Assertion and reason both are true but reason is not correct explanation of assertion.
C
Assertion is true but reason is wrong.
D
Assertion and reason both are wrong.
32
The vestibular apparatus, responsible for maintaining body balance, consists of:
A
Semicircular canals and Otolith organ
B
Cochlea and Organ of Corti
C
Malleus and Incus
D
Pinna and Auditory canal
33
The 'Organ of Corti' is located on the:
A
Basilar membrane
B
Reissner's membrane
C
Tectorial membrane
D
Tympanic membrane
34
The white matter of the brain is mainly composed of:
A
Neuron cell bodies
B
Myelinated nerve fibres
C
Unmyelinated dendrites
D
Synaptic knobs
35
In neuron, the granular bodies found in the cell body and dendrites are called:
A
Schwann cells
B
Nodes of Ranvier
C
Nissl's granules
D
Synaptic vesicles
36
The correct sequence of a reflex arc is:
A
Receptor → Sensory neuron → CNS → Motor neuron → Effector
B
Receptor → Motor neuron → CNS → Sensory neuron → Effector
C
Effector → Sensory neuron → CNS → Motor neuron → Receptor
D
CNS → Sensory neuron → Receptor → Motor neuron → Effector
37
The membranes of the brain from outer to inner are:
A
Dura mater → Arachnoid → Pia mater
B
Pia mater → Arachnoid → Dura mater
C
Arachnoid → Dura mater → Pia mater
D
Dura mater → Pia mater → Arachnoid
38
Which of the following is responsible for daylight (photopic) vision and color vision?
A
Rods
B
Cones
C
Ciliary body
D
Choroid
39
The coiled portion of the labyrinth is called:
A
Semicircular canals
B
Cochlea
C
Vestibule
D
Ampulla
40
The sympathetic nervous system generally prepares the body for:
A
Digestion
B
Rest and sleep
C
Fight or flight response
D
Memory storage
41
The gaps between two adjacent myelin sheaths are called:
A
Synaptic cleft
B
Nodes of Ranvier
C
Schwan gaps
D
Dendrites
42
Which part of the brain is mainly responsible for regulation of hunger, thirst and body temperature?
A
Cerebellum
B
Medulla oblongata
C
Hypothalamus
D
Pons
43
Nissl’s granules are mainly present in:
A
Axon
B
Dendrite and cyton
C
Myelin sheath
D
Synaptic cleft
44
The electrical potential difference across the plasma membrane at the site of excitation is called:
A
Resting potential
B
Action potential
C
Spike potential
D
Both B and C
45
Association area are :-
A
Sensory area found in deep part of cerebral cortex
B
Motor area found in surface layer of grey matter of cerebrum
C
Neither sensory nor motor and found in grey matter of cerebrum
D
Hypothalamic neurons which secrete hormones
46
Read the following statements carefully and find out the correct ?
(1) A single schwann cell forms myelin around one and only one axon, while a single oligodendrocyte forms myelin around several separate axons.
(2) During an action potential, influx of Na⁺ in axon interior will exceed the external Na⁺ concentration.
(3) During inhibitory synaptic potential (IPSP) external K⁺ concentration rise until it exceeds the internal K⁺.
(4) Unmyelinated axons generally have a lesser diameter than myelinated axons.
A
1, 2, 3 and 4
B
2 and 3 only
C
3 and 4 only
D
1 and 4 only
47
A reflex action is:
A
Voluntary and conscious
B
Involuntary and conscious
C
Involuntary and unconscious
D
Voluntary and unconscious
48
The spinal cord is protected by:
A
Skull
B
Ribs
C
Vertebral column
D
Pelvic girdle
49
Which of the following is the correct functional unit of the nervous system?
A
Nephron
B
Neuron
C
Sarcomere
D
Osteon
50
A man suffers from loss of appetite, extreme thirst, and low body temperature. This indicates a tumor in the:
A
Medulla
B
Pons
C
Cerebellum
D
Hypothalamus
51
The autonomic nervous system controls:
A
Voluntary actions
B
Reflex actions only
C
Involuntary functions
D
Memory and intelligence
52
Select the correct sequence of steps in the mechanism of hearing:
A
Pinna → Auditory canal → Tympanic membrane → Malleus → Incus → Stapes → Cochlea → Auditory nerve
B
Pinna → Cochlea → Malleus → Incus → Stapes → Auditory canal
C
Auditory canal → Pinna → Tympanic membrane → Cochlea
D
Pinna → Malleus → Incus → Stapes → Auditory canal → Cochlea
53
The pigment 'Rhodopsin' (visual purple) is found in:
A
Cones
B
Rods
C
Iris
D
Sclera
54
The space between the cornea and the lens is filled with:
A
Vitreous humor
B
Aqueous humor
C
Cerebrospinal fluid
D
Perilymph
55
The gap between two neurons at a synapse is called:
A
Node
B
Axon hillock
C
Synaptic cleft
D
Dendritic knob
56
The brain stem consists of:
A
Forebrain, Midbrain and Hindbrain
B
Midbrain, Pons and Medulla oblongata
C
Cerebrum, Cerebellum and Medulla
D
Thalamus and Hypothalamus
57
Which of the following is true regarding saltatory conduction?
A
It occurs in non-myelinated neurons only
B
Impulse jumps from one node of Ranvier to another
C
It slows down nerve conduction
D
It occurs only in dendrites
58
The region of brain that acts as a relay centre for sensory impulses is:
A
Hypothalamus
B
Thalamus
C
Cerebellum
D
Medulla
59
Following are some statements related to neuron. Select the false statement:
A
The cell body and dendrites contain certain granular bodies called Nissl's granules
B
Dendrites transmit impulses towards the cell body
C
Schwann cells are seen only in myelinated neurons
D
Myelinated nerve fibres are found in spinal and cranial nerves
60
Specific receptors of the vestibular apparatus responsible for maintenance of balance and posture are:
A
Organ of Corti
B
Crista and Macula
C
Basilar membrane
D
Tectorial membrane
61
Which of the following is NOT a part of hindbrain?
A
Cerebellum
B
Pons
C
Medulla oblongata
D
Thalamus
62
Which of the following statements are correct regarding electrical synapse ?
(a) Pre and postsynaptic membrane of neurons are in very close proximity at electric synapse.
(b) In electrical synapse impulse transmitted in one directional only.
(c) Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon.
(d) Impulse transmission is always faster in electric synapse than that across a chemical synapse.
A
a, b and d
B
a, c and d
C
b, c and d
D
a, b, c and d
63
The ionic gradients across the resting membrane are maintained by the active transport of ions by the:
A
Sodium-potassium pump
B
Calcium pump
C
Simple diffusion
D
Osmosis
64
The parasympathetic nervous system mainly functions to:
A
Increase heartbeat
B
Prepare body for stress
C
Conserve energy and restore normal state
D
Increase pupil size
65
The Limbiс system (Limbic lobe) is associated with:
A
Regulation of sexual behavior
B
Expression of emotional reactions
C
Motivation
D
All of the above
66
Myelin sheath in neurons is formed by:
A
Neurilemma
B
Schwann cells
C
Dendrites
D
Nissl granules
67
In the following flow diagram, identify the correct labelling (A and B). 
(i) A is the afferent nerve fibres transmit impulses from tissues/organs to the ANS
(ii) B is the efferent fibres transmit regulatory impulses from the CNS to the concerned peripheral tissues/organs.
(iii) A is the afferent nerve fibres transmit impulses from tissues/organs to the CNS.
(iv) B is the afferent fibres transmit regulatory impulses from the CNS to the concerned peripheral tissues/organs.
A
i and iv
B
i, ii and iv
C
ii and iii
D
i, ii, iii and iv
68
The ear ossicles (Malleus, Incus, Stapes) are found in the:
A
External ear
B
Middle ear
C
Inner ear
D
Eustachian tube
69
Five events in the transmission of nerve impulse across the synapse are given below :
A. Opening of specific ion channels allows the entry of ions in the post-synaptic neuron.
B. Neurotransmitter binds to the receptor on post synaptic membrane
C. Synaptic vesicle fuses with pre-synaptic membrane, neurotransmitter releases into synaptic cleft.
D. Depolarization of post-synaptic membrane
E. Arrival of action potential at axon terminal. In which sequence to the events occur?
A
E → C → B → A → D
B
A → B → C → D → E
C
A → B → D → C → E
D
E → D → C → A → B
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