Practice Corner MCQs

Question 1 of 81

1. Question

In which animal, nerve cell is present but brain is absent?

Sponge
Cockroach
Honeybee
Hydra

Question 2 of 81

2. Question

Read the given statements and select the incorrect one.

In Hydra, all neurons are similar and join to form a nerve net.
In earthworms, nervous system consists of a dorsal nerve cord, paired ganglia and segmental nerves.
Brain is present in insects.
Planaria has two nerve cords that join to form rudimentary brain.

Question 3 of 81

3. Question

Neurons in sponges are

unipolar
bipolar
multipolar
absent

Question 4 of 81

4. Question

Visceral nervous system is part of

ANS
PNS
CNS
none of these

Question 5 of 81

5. Question

Afferent nerve fibre carries impulses from

effector to central neural system
receptor to central neural system
central neural system to muscle
central neural system to receptors

Question 6 of 81

6. Question

Skeletal muscles are controlled by

sympathetic nerves
parasympathetic nerves
somatic nerves
autonomic nerves

Question 7 of 81

7. Question

In a human being, the number of cranial nerves is

12 pairs
6 pairs
20 pairs
10 pairs

Question 8 of 81

8. Question

Select the correct match.

Olfactory nerve – Motor
Trigeminal nerve – Motor
Trochlear – Mixed
Optic nerve – Sensory

Question 9 of 81

9. Question

Which one of the following transmits impulses to central neural system?

Abducens nerve
Trochlear nerve
Oculomotor nerve
Auditory nerve

Question 10 of 81

10. Question

Sympathetic neural system

increase BP
dilates pupil
both (a) and (b)
none of these

Question 11 of 81

11. Question

Which of the following cranial nerves of man is both sensory and motor?

Olfactory
Optic
Trigeminal
Oculomotor

Question 12 of 81

12. Question

The flow chart given here shows the functional organisation of the human neural system. Identify A to E and select the correct option.

A-PNS, B-CNS, C-ANS, D-Sympathetic neural system, E-Parasympathetic neural system
A-ANS, B-CNS, C-PNS, D-Parasympathetic neural system, E-Sympathetic neural system
A-CNS, B-PNS, C-ANS, D-Sympathetic neural system, E-Parasympathetic neural system
A-ANS, B-PNS, C-CNS, D-Parasympathetic neural system, E-Sympathetic neural system

Question 13 of 81

13. Question

One of the examples of the action of the autonomous neural system is

swallowing of food
pupillary reflex
peristalsis of the intestine
all of these

Question 14 of 81

14. Question

Sympathetic neural system induces

secretion of digestive juices
heartbeat
secretion of saliva
all of these

Question 15 of 81

15. Question

Which of the following options correctly identifies the effect of sympathetic and parasympathetic neural system on given features or organs?

\(
\begin{array}{|l|l|l|l|}
\hline & \text { Feature/ organ } & \begin{array}{l}
\text { sympathetic neural } \\
\text { system }
\end{array} & \begin{array}{l}
\text { Parasym- pathetic } \\
\text { neural system }
\end{array} \\
\hline \text { (a) } & \text { Salivary glands } & \text { Stimulates secretion } & \text { Inhibits secretion } \\
\hline \text { (b) } & \text { Pupil of the eye } & \text { Dilates } & \text { Constricts } \\
\hline \text { (c) } & \text { Heart rate } & \text { Decreases } & \text { increases } \\
\hline \text { (d) } & \begin{array}{l}
\text { Intestinal } \\
\text { peristalsis }
\end{array} & \text { Decreases Stimulates } & \text { Increases inhibits } \\
\hline
\end{array}
\)

a
b
c
d

Question 16 of 81

16. Question

Which of the following pairs correctly identifies function of parasympathetic nervous system?

Slows heartbeat, promotes pancreatic secretion
Increases secretion of sweat gland and intestinal gland
Accelerates heartbeat, dilates arteries
Raises blood pressure, increases peristaltic activity

Question 17 of 81

17. Question

Visceral nervous system comprises of

nerve fibres
ganglia
plexuses
all of these

Question 18 of 81

18. Question

The given figure shows the structure of a neuron. Select the option that correctly identifies the parts labelled as A to E.

\(
\begin{array}{|c|c|c|c|c|c|}
\hline & \text { A } & \text { B } & \text { C } & \text { D } & \text { E } \\
\hline \text { (a) } & \begin{array}{l}
\text { Nerve } \\
\text { fibres }
\end{array} & \text { Cyton } & \begin{array}{l}
\text { Schwann } \\
\text { cell }
\end{array} & \begin{array}{l}
\text { Node of } \\
\text { Ranvier }
\end{array} & \begin{array}{l}
\text { Synaptic } \\
\text { knob }
\end{array} \\
\hline \text { (b) } & \text { Dendrites } & \text { Cyton } & \begin{array}{l}
\text { Schwann } \\
\text { cell }
\end{array} & \begin{array}{l}
\text { Node of } \\
\text { Ranvier }
\end{array} & \begin{array}{l}
\text { Synapti } \\
\text { knob }
\end{array} \\
\hline \text { (c) } & \text { Dendrites } & \begin{array}{l}
\text { Nerve } \\
\text { cell }
\end{array} & \begin{array}{l}
\text { Schwann } \\
\text { cell }
\end{array} & \begin{array}{l}
\text { Synaptic } \\
\text { knob }
\end{array} & \begin{array}{l}
\text { Node of } \\
\text { Ranvier }
\end{array} \\
\hline \text { (d) } & \text { Axons } & \text { cyton } & \text { Nerve cell } & \begin{array}{l}
\text { Node of } \\
\text { Ranvier }
\end{array} & \begin{array}{l}
\text { Synaptic } \\
\text { knob }
\end{array} \\
\hline
\end{array}
\)

a
b
c
d

Question 19 of 81

19. Question

Myelin sheath is formed by

Ranvier cells
muscle cells
Schwann cells
axon

Question 20 of 81

20. Question

In a medullated nerve fibre, the conduction of impulse is faster due to the presence of

pericytes
endoneurium and epineurium
myelin sheath and nodes of Ranvier
Nissl's granules

Question 21 of 81

21. Question

Read the given paragraph.
In the resting state, the axonal membrane is (i) with more (ii) charged ions outside than inside. This unequal distribution of ions is due to the selective permeability of the membrane, which forms an almost impenetrable barrier to (iii) and the action of the (iv) which pumps (v) \(\mathrm{Na}^{+}\)out of the neuron for every (vi) \(\mathrm{K}^{+}\)brought in. Select the option that correctly fills the blanks in the paragraph.

\(
\begin{array}{|c|c|c|c|c|c|c|}
\hline & \text { (i) } & \text { (ii) } & \text { (iii) } & \text { (iv) } & \text { (v) } & \text { (iv) } \\
\hline \text { (a) } & \text { depolarised } & \text { positively } & \mathrm{Na}^{+} & \begin{array}{l}
\text { sodium- potassium } \\
\text { pump }
\end{array} & \text { three } & \text { two } \\
\hline \text { (b) } & \text { depolarised } & \text { negatively } & \mathrm{Na}^{+} & \begin{array}{l}
\text { sodium-potasium } \\
\text { pump }
\end{array} & \text { three } & \text { two } \\
\hline \text { (c) } & \text { polarised } & \text { negatively } & N a^{+} & \begin{array}{l}
\text { sodium-potasium } \\
\text { pump }
\end{array} & \text { three } & \text { two } \\
\hline \text { (d) } & \text { polarised } & \text { positively } & \mathrm{Na}^{+} & \begin{array}{l}
\text { sodium-potasium } \\
\text { pump }
\end{array} & \text { three } & \text { two } \\
\hline
\end{array}
\)

a
b
c
d

Question 22 of 81

22. Question

A nerve fibre during resting stage is

more permeable to \(\mathrm{Na}^{+}\)
more permeable to \(\mathrm{K}^{+}\)
equally permeable for \(\mathrm{Na}^{+}\)and \(\mathrm{K}^{+}\)
less permeable to \(\mathrm{K}^{+}\)

Question 23 of 81

23. Question

Which of the following options illustrates the distribution of \(\mathrm{Na}^{+}\)and \(\mathrm{K}^{+}\)ions in a section of non-myelinated axon which is at resting potential?

a
b
c
d

Question 24 of 81

24. Question

Sodium-potassium pump transports

\(\mathrm{Na}^{+}\)and \(\mathrm{K}^{+}\)out of the neuron
\(\mathrm{Na}^{+}\)and \(\mathrm{K}^{+}\)into the neuron
\(\mathrm{Na}^{+}\)into the neuron and \(\mathrm{K}^{+}\)out of the neuron
\(\mathrm{K}^{+}\)into the neuron and \(\mathrm{Na}^{+}\)out of the neuron

Question 25 of 81

25. Question

In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive

\(\mathrm{Ca}^{2+}\) into the cell
\(\mathrm{K}^{+}\)and \(\mathrm{Na}^{+}\)out of the cell
\(\mathrm{Na}^{+}\)into the cell
\(\mathrm{Na}^{+}\)out of the cell

Question 26 of 81

26. Question

Which of the following statements are correct regarding \(\mathrm{Na}^{+}-\mathrm{K}^{+}\)pump?
(i) Needs energy (ATP) to work
(ii) Expels \(3 \mathrm{Na}^{+}\)for every \(2 \mathrm{~K}^{+}\)ions imported
(iii) Works against a concentration gradient
(iv) Maintains resting potential

(i) and (iv)
(ii) and (iii)
(i) and (iii)
All of these

Question 27 of 81

27. Question

The electrical potential difference between outside and inside of a nerve axon before excitation is known as

resting potential
action potential
spike potential
reaction potential

Question 28 of 81

28. Question

A typical value of resting membrane potential is

\(-100 \mathrm{mV}\)
\(-70 \mathrm{mV}\)
\(-40 \mathrm{mV}\)
\(-60 \mathrm{mV}\)

Question 29 of 81

29. Question

Complete the following paragraph by selecting the option that gives the correct sequence of words. When a stimulus is applied at a site on the polarised membrane, the membrane at that site becomes freely permeable to (i) ions. It causes rapid influx of (ii) ions leading to (iii) of the membrane.

\(
\begin{array}{|l|l|l|l|}
\hline & \text { (i) } & \text { (ii) } & \text { (iii) } \\
\hline \text { (a) } & N a^{+} & K^{+} & \text {depolarisation } \\
\hline \text { (b) } & K^{+} & K^{+} & \text {depolarisation } \\
\hline \text { (c) } & K^{+} & N a^{+} & \text {depolarisation } \\
\hline \text { (d) } & N a^{+} & N a^{+} & \text {depolarisation } \\
\hline
\end{array}
\)

a
b
c
d

Question 30 of 81

30. Question

During depolarisation, the outer surface of the membrane becomes

negatively charged
positively charged
neutrally charged
none of these

Question 31 of 81

31. Question

Depolarisation of axolemma during nerve conduction takes place because

equal amount of \(\mathrm{Na}^{+}\)and \(\mathrm{K}^{+}\)move out across axolemma
only \(\mathrm{Na}^{+}\)move inside
more \(\mathrm{Na}^{+}\)moves outside than \(\mathrm{K}^{+}\)moving outside
none of these

Question 32 of 81

32. Question

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?

First positive, then negative and continue to be negative
First negative, then positive and continue to be positive
First positive, then negative and again back to positive
First negative, then positive and again back to negative

Question 33 of 81

33. Question

Saltatory conduction of impulse occurs in

liver cells
non-myelinated nerve fibres
myelinated nerve fibres
none of these

Question 34 of 81

34. Question

Read the given statements and select the correct ones.
(i) Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body.
(ii) Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath.
(iii) Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions \(\left(\mathrm{K}^{+}\right)\)than to sodium ions \(\left(\mathrm{Na}^{+}\right)\).
(iv) A synapse is formed by the membranes of a presynaptic neuron and a post-synaptic neuron.

(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)

Question 35 of 81

35. Question

The junction between the axon of one neuron and the dendrite of the next is called

constant bridge
junction point
joint
synapse

Question 36 of 81

36. Question

Which of the following statements is/are incorrect about the electrical synapse?
(i) At electrical synapses, the membranes of pre and post-synaptic neurons are in very close proximity.
(ii) Electrical current can flow directly from one neuron into the other across the synapses.
(iii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along single axon.
(iv) Electrical synapses pass electrical signal between cells with the use of Ach.
(v) Electrical synapses are fast.
(vi) Electrical synapses are rare in our system.

(ii), (iv) and (v)
(i) and (iii)
(iv) only(iv) only
(i), (v) and (vi)

Question 37 of 81

37. Question

A list of events occurring in the transmission of nerve impulse across the synapse is given below in a random order.
(i) Opening of specific ion channels allows the entry of ions, a new action potential is generated in the post-synaptic neuron.
(ii) Neurotransmitter binds to the receptor on post synaptic membrane.
(iii) Synaptic vesicle fuses with pre-synaptic membrane, neurotransmitter release into synaptic cleft.
(iv) Depolarisation of pre-synaptic membrane.
(v) Arrival of action potential at axon terminal.
Which of the following options represents these events in the correct order?

(v) \(\rightarrow\) (iv) \(\rightarrow\) (iii) \(\rightarrow\) (ii) \(\rightarrow\) (i)
(i) \(\rightarrow\) (ii) \(\rightarrow\) (iii) \(\rightarrow\) (iv) \(\rightarrow\) (v)
(i) \(\rightarrow\) (ii) \(\rightarrow\) (iv) \(\rightarrow\) (iii) \(\rightarrow\) (v)
(v) \(\rightarrow\) (iv) \(\rightarrow\) (iii) \(\rightarrow\) (i) \(\rightarrow\) (ii)

Question 38 of 81

38. Question

The given diagram shows axon terminal. Select the option that correctly matches the steps in transmission of impulses (list i – vii) with the labellings (A-C) in the diagram.

(i) Chemicals called neurotransmitters are released in the synaptic cleft through ion channels.
(ii) When an impulse arrives at the axon terminal, it stimulates the movement of synaptic vesicles.
(iii) Neurotransmitters are endocytosed into the neurons.
(iv) The ion channels close with the binding of neurotransmitters to their specific receptors vesicles.
(v) Synaptic vesicles move toward the membrane where they fuse with the plasma membrane.
(vi) Neurotransmitters are released in the synaptic cleft.
(vii) The released transmitters bind to their specific receptors on the post-synaptic membrane.

\(
\begin{array}{llll}
& \text { A } & \text { B } & \text { C } \\
\text { (a) } & \text { (ii) } & \text { (iii) } & \text { (i) } \\
\text { (b) } & \text { (v) } & \text { (vi) } & \text { (iv) } \\
\text { (c) } & \text { (ii) } & \text { (vi) } & \text { (vii) } \\
\text { (d) } & \text { (v) } & \text { (iii) } & \text { (iv) }
\end{array}
\)

a
b
c
d

Question 39 of 81

39. Question

The given diagram shows axon terminal and synapse. Here A, B, C, D and E respectively represent

Axon terminal, synaptic cleft, synaptic vesicle, neurotransmitters and receptors
Axon terminal, synaptic vesicle, synaptic cleft, receptors and neurotransmitters
Synaptic cleft, synaptic vesicle, axon terminal, neurotransmitters and receptors
Synaptic cleft, axon terminal, synaptic vesicle, neurotransmitters and receptors

Question 40 of 81

40. Question

Which one of the following does not act as a neurotransmitter?

Cortisone
Acetylcholine
Dopamine
Norepinephrine

Question 41 of 81

41. Question

Read the given statements and select the correct option.
(i) Synaptic cleft of neurons secretes adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
(iv) Spinal and cranial nerves are made of non-myelinated nerve fibres.

Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrect.
Statements (i), (ii) and (iii) are correct but statement (iv) is incorrect.
Statements (iii) and (iv) are correct but statements (i) and (ii) are incorrect.
Statements (ii) and (iii) are correct but statements (i) and (iv) are incorrect.

Question 42 of 81

42. Question

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

nerve fibre is insulated by a medullary sheath
sodium pump starts operating only at the cyton and then continues into the nerve fibre
neurotransmitters are released by dendrites and not by axon endings
neurotransmitters are released by the axon endings and not by dendrites

Question 43 of 81

43. Question

Brain depends on blood for the supply of

ATP and glucose
oxygen and ATP
oxygen and glucose
oxygen and electrolytes

Question 44 of 81

44. Question

The given figure shows lateral view of the human brain. Identify the parts labelled as A to E and select the correct option.

\(
\begin{array}{|l|l|l|l|l|l|}
\hline & {\text { A }} & \text { B } & \text { C } & \text { D } & \text { E } \\
\hline \text { (a) } & \begin{array}{l}
\text { Temporal } \\
\text { lobe }
\end{array} & \begin{array}{l}
\text { Corpus } \\
\text { callosum }
\end{array} & \text { Cerebellum } & \begin{array}{l}
\text { Medulla } \\
\text { oblongata }
\end{array} & \text { Frontal lobe } \\
\hline \text { (b) } & \text { Frontal lobe } & \text { Thalamus } & \text { Cerebrum } & \begin{array}{l}
\text { Medulla } \\
\text { oblongata }
\end{array} & \begin{array}{l}
\text { Occipital } \\
\text { lobe }
\end{array} \\
\hline \text { (c) } & \begin{array}{l}
\text { Temporal } \\
\text { lobe }
\end{array} & \text { Pons } & \text { Cerebrum } & \begin{array}{l}
\text { Medulla } \\
\text { oblongata }
\end{array} & \text { Frontal lobe } \\
\hline \text { (d) } & \text { Frontal lobe } & \begin{array}{l}
\text { Corpus } \\
\text { callosum }
\end{array} & \text { Cerebellum } & \begin{array}{l}
\text { Medulla } \\
\text { oblongata }
\end{array} & \begin{array}{l}
\text { Parietal } \\
\text { lobe }
\end{array} \\
\hline
\end{array}
\)

a
b
c
d

Question 45 of 81

45. Question

The correct sequence of meninges from inner to outer side is

duramater \(\rightarrow\) arachnoid membrane \(\rightarrow\) piamater
duramater \(\rightarrow\) piamater \(\rightarrow\) arachnoid membrane
piamater \(\rightarrow\) arachnoid membrane \(\rightarrow\) duramater
arachnoid membrane \(\rightarrow\) duramater \(\rightarrow\) piamater

Question 46 of 81

46. Question

What is the space between the arachnoid and piamater called?

Supra-arachnoid space
Sub-arachnoid space
Subdural space
Meninges

Question 47 of 81

47. Question

The given figure shows a section of brain. Identify the parts labelled as A, B, C and D and match them with the names ( i – vii) given below.
(i) Arachnoid membrane
(ii) Subdural space
(iii) Duramater
(iv) Bone
(vi) Grey matter
(v) White matter
(vii) Piamater

\(
\begin{array}{lllll}
& \text { A } & \text { B } & \text { C } & \text { D } \\
\text { (a) } & \text { (iii) } & \text { (ii) } & \text { (vi) } & \text { (v) } \\
\text { (b) } & \text { (i) } & \text { (ii) } & \text { (iii) } & \text { (vi) } \\
\text { (c) } & \text { (iii) } & \text { (i) } & \text { (vii) } & \text { (vi) } \\
\text { (d) } & \text { (iv) } & \text { (vii) } & \text { (i) } & \text { (ii) }
\end{array}
\)

a
b
c
d

Question 48 of 81

48. Question

A Corpus callosum connects two

cerebral hemispheres
ventricles of brain
cerebellar hemispheres
optic thalamus

Question 49 of 81

49. Question

The canal that passes through the midbrain is

corpus callosum
hypothalamus
cerebral aqueduct
corpora quadrigemina

Question 50 of 81

50. Question

In the accompanying diagram of a part of the human body, the structures belonging to the central neural system are labelled as

A and C
B and C
A and D
C and D

Question 51 of 81

51. Question

Which of the following structures is found in diencephalon?

Pons
Basal ganglia
Corpora quadrigemina
Hypothalamus

Question 52 of 81

52. Question

The association areas are responsible for

intersensory association
communication
memory
all of these

Question 53 of 81

53. Question

All sensory information to be registered consciously by the forebrain must pass via the

thalamus
reticular activating system
cerebellum
pons

Question 54 of 81

54. Question

Human body temperature is maintained by

hypothalamus
medulla oblongata
pituitary
cerebral cortex

Question 55 of 81

55. Question

Neurosecretory cells are present in

cerebral hemisphere
cerebellum
hypothalamus
medulla oblongata

Question 56 of 81

56. Question

Which part of the human brain controls the urge for eating and drinking?

Forebrain
Hindbrain
Midbrain
Spinal cord

Question 57 of 81

57. Question

Sense of smell is perceived by

occipital lobe
olfactory lobe
temporal lobe
parietal lobe

Question 58 of 81

58. Question

Which of the following is a part of our brain?

Corpora allata
Corpora cardiaca
Corpora adiposa
Corpora quadrigemina

Question 59 of 81

59. Question

The optic lobes in humans are represented by

corpora bigemina
Wernicke's area
corpora arenacea
corpora quadrigemina

Question 60 of 81

60. Question

‘Pons’ connects the

two cerebral hemispheres
two lobes of cerebellum
cerebrum and cerebellum
spinal cord with the brain

Question 61 of 81

61. Question

Cerebellum of brain is concerned with

controlling rapid muscular activities
learning in early stages
maintaining posture, orientation and equilibrium of body
all of these

Question 62 of 81

62. Question

Tree of life is

branchial tree
arbor vitae
lymphatic system
loop of Henle

Question 63 of 81

63. Question

Match column I with column II and select the correct option from the given codes.

\(
\begin{array}{|l|l|c|l|}
\hline & \text { Column I } & & \text { Column II } \\
\hline \text { A. } & \text { Cerebrum } & \text { (i) } & \text { Controls the pituitary } \\
\hline \text { B. } & \text { Cerebellum } & \text { (ii) } & \text { Controls vision and hearing } \\
\hline \text { C. } & \text { Hypothalamus } & \text { (iii) } & \text { Controls the rate of heart beat } \\
\hline \text { D. } & \text { Midbrain } & \text { (iv) } & \text { Seat of intelligence } \\
\hline & & \text { (v) } & \text { Maintains body posture } \\
\hline
\end{array}
\)

A-(v), B-(iv), C-(ii), D-(iii)
A-(iv), B-(v), C-(ii), D-(i)
A-(v), B-(iv), C-(i), D-(iii)
A-(iv), B-(v), C-(i), D-(ii)

Question 64 of 81

64. Question

Which of the following statements is correct regarding cerebellum?

It is a part of hindbrain.
It consists of two cerebellar hemisphere and a vermis.
Arbor vitae is present in cerebellum.
All of these

Question 65 of 81

65. Question

The part of human hindbrain that is responsible for hand-eye coordination is

cerebellum
pons varolii
medulla oblongata
thalamus

Question 66 of 81

66. Question

The respiratory and cardiac centres are located in

cerebrum
diencephalon
crura cerebri
medulla oblongata

Question 67 of 81

67. Question

Salivation in mammals is under the control of

medulla oblongata
mesencephalon
hypothalamus
cerebellum

Question 68 of 81

68. Question

Refer to the diagram of human brain below.

Which labelled part controls the process of breathing?

A
B
C
D

Question 69 of 81

69. Question

Refer the diagram below.

Which of the following functions is performed by the part labelled ‘ C ‘ in the given figure?

Regulation of body temperature
Regulation of gastric secretions
Learning
Maintaining posture

Question 70 of 81

70. Question

Which of the following parts of brain constitute the brain stem?

Midbrain and hindbrain
Hindbrain and forebrain
Forebrain and midbrain
Forebrain only

Question 71 of 81

71. Question

Cell bodies of neurons bringing afferent information into the spinal cord are located in

dorsal root ganglia
ventral root ganglia
grey matter of the spinal cord
white matter of the spinal cord

Question 72 of 81

72. Question

Which of the following has \(\mathrm{H}\)-shaped grey matter?

Cerebrum
Medulla oblongata
Cerebellum
Spinal cord

Question 73 of 81

73. Question

What is the correct path of a reflex arc?

Sensory stimulus \(\rightarrow\) Dendrite \(\rightarrow\) Axon
Motor nerves \(\rightarrow\) Acetylcholine \(\rightarrow\) Adjustor neuron
Efferent nerves \(\rightarrow\) Connector nerves \(\rightarrow\) Motor nerves
Afferent nerves \(\rightarrow\) Efferent nerves \(\rightarrow\) Connector nerves

Question 74 of 81

74. Question

For good reflex actions we require intact

spinal cord
hypothalamus
medulla oblongata
cerebellum.

Question 75 of 81

75. Question

The path of the reflex arc is shown in the given figure. Identify the different labellings A, B, C, D, E, and F and select the correct option.

\(
\begin{array}{|l|l|l|l|l|l|l|}
\hline {\text { A }} & \text { B } & \text { C } & \text { D } & \text { E } & \text { F } \\
\hline \text { (a) } & \text { Stimulus } & \text { Effector } & \text { sensory nerve } & \text { Motor nerve } & \text { Receptor } & \text { Response } \\
\hline \text { (b) } & \text { Stimulus } & \text { Receptor } & \text { Sensory nerve } & \text { Motor nerve } & \text { Effector } & \text { Response } \\
\hline \text { (c) } & \text { Stimulus } & \text { Effector } & \text { Motor nerve } & \text { Sensory nerve } & \text { Receptor } & \text { Response } \\
\hline \text { (d) } & \text { Stimulus } & \text { Receptor } & \text { Motor nerve } & \text { Sensory nerve } & \text { Effector } & \text { Response } \\
\hline
\end{array}
\)

a
b
c
d

Question 76 of 81

76. Question

Which of the following is an example of a conditioned reflex?

Hand withdraws when pierced with a needle
Eyes close, when anything enters into them
During digestion, food goes forward in alimentary canal
Trained dog salivates when you ring a bell

Question 77 of 81

77. Question

Which of the following is not a reflex action?

Salivation
Sweating
Withdrawal of hand when pinched by needle
None of these

Question 78 of 81

78. Question

The given diagrammatic representation of reflex action shows knee jerk reflex.

Identify the parts labelled as A to E and select the correct option.

\(
\begin{array}{|l|l|l|l|l|l|}
\hline & {\text { A }} & \text { B } & \text { C } & \text { D } & \text { E } \\
\hline \text { (a) } & \begin{array}{l}
\text { Dorsal root } \\
\text { ganglion }
\end{array} & \begin{array}{l}
\text { White } \\
\text { matter }
\end{array} & \text { Grey matter } & \begin{array}{l}
\text { Afferent } \\
\text { pathway }
\end{array} & \begin{array}{l}
\text { Efferent } \\
\text { pathway }
\end{array} \\
\hline \text { (b) } & \begin{array}{l}
\text { Dorsal root } \\
\text { ganglion }
\end{array} & \begin{array}{l}
\text { White } \\
\text { matter }
\end{array} & \text { Grey matter } & \begin{array}{l}
\text { Efferent } \\
\text { pathway }
\end{array} & \begin{array}{l}
\text { Afferent } \\
\text { pathway }
\end{array} \\
\hline \text { (c) } & \begin{array}{l}
\text { Ventral root } \\
\text { ganglion }
\end{array} & \text { Grey matter } & \text { White matter} & \begin{array}{l}
\text { Efferent } \\
\text { pathway }
\end{array} & \begin{array}{l}
\text { Afferent } \\
\text { pathway }
\end{array} \\
\hline \text { (d) } & \begin{array}{l}
\text { Ventral root } \\
\text { ganglion }
\end{array} & \begin{array}{l}
\text { White } \\
\text { matter }
\end{array} & \text { Grey matter } & \begin{array}{l}
\text { Efferent } \\
\text { pathway }
\end{array} & \begin{array}{l}
\text { Afferent } \\
\text { pathway }
\end{array} \\
\hline
\end{array}
\)

a
b
c
d

Question 79 of 81

79. Question

Following is the figure of a sagittal section of a human brain. Match the labelled parts with the respective statements given and select the correct option.
(i) Consists of fibre tracts that interconnect left and right hemispheres
(ii) Secretes a hormone melatonin
(iii) Alcohol interferes with the function of this part
(iv) Contains centres which control respiration, cardiovascular reflexes and gastric secretions

A-(ii), B-(iii), C-(i), D-(iv)
A-(iv), B-(i), C-(iii), D-(ii)
A-(iii), B-(ii), C-(iv), D-(i)
A-(i), B-(iv), C-(ii), D-(iii)

Question 80 of 81

80. Question

Select the answer with the correct matching of cranial nerve, its nature, origin and functions.

\(
\begin{array}{|c|c|c|c|c|}
\hline & \begin{array}{l}
\text { Cranial } \\
\text { nerve }
\end{array} & \text { Nature } & \text { Origin } & \text { Functions } \\
\hline \text { (a) } & \text { Trigeminal } & \text { Motor } & \begin{array}{l}
\text { Floor } \\
\text { of mid. } \\
\text { brain }
\end{array} & \begin{array}{l}
\text { Skin sensation, } \\
\text { tongue movement }
\end{array} \\
\hline \text { (b) } & \text { Oculomotor } & \text { Motor } & \begin{array}{l}
\text { Floor } \\
\text { of mid- } \\
\text { brain }
\end{array} & \begin{array}{l}
\text { Movement } \\
\text { of eyeball } \\
\text { and power of } \\
\text { accommodation }
\end{array} \\
\hline \text { (c) } & \text { Abducens } & \text { Sensory } & \text { Pons } & \begin{array}{l}
\text { Movement } \\
\text { of eyeball } \\
\text { and power of } \\
\text { accommodation }
\end{array} \\
\hline \text { (d) } & \text { Hypoglossal } & \text { Motor } & \text { Pons } & \begin{array}{l}
\text { Swallowing and } \\
\text { salivation }
\end{array} \\
\hline
\end{array}
\)

a
b
c
d

Question 81 of 81

81. Question

Refer to the given figure and select the correct option regarding it.

It is unipolar in ageing cells.
It is of only two types; dendritic and axonic.
It is not physically connected with other cell of its type.
It possesses multiple nuclei.

CLASS-XI BIOLOGY + NEET

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