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1.

A major coordinating center for sensory and motor signaling in the human brain is shown in the given sagittal section by the letter:

1. A
2. B
3. C
4. D

2.

The rise in stimulus-induced permeability to
a. Potassium ions
b. Sodium ions
c. Restoring RMP
d. Diffusion of potassium ions
Arrange them in order.

3.

Which of the following has not to be there in a chemical synapse?

4.

Which of the following is not associated with Impulse transmission across an electrical synapse?

5.

Synaptic cleft is not

6.

Nerve impulse travelling through synapses cannot be

7.

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

1.	junction point	2.	a synapse
3.	a joint	4.	constant bridge

8.

Which of the following structures or regions is
incorrectly paired with its function?
1. limbic system—screening of information between
the spinal cord and the brain; regulates arousal
and sleep
2. medulla oblongata—homeostatic control center
3. cerebellum—unconscious coordination of
movement and balance
4. corpus callosum—band of fibers connecting left
and right cerebral hemispheres

9.

Olfactory epithelium extends directly into which of the following extensions of the brain’s limbic system?

1. Amygdala	2. Olfactory lobe
3. Septum	4. Hippocampus

10.

The change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals is called as:
1. Action potential
2. Threshold potential
3. Reversal potential
4. Excitatory post synaptic potential

11.

___A___ is a major coordinating centre for sensory and motor signaling present in the forebrain of the central nervous system. Here ‘A’ is:
1. Association area
2. Thalamus
3. Pons
4. Hypothalamus

12.

Which amongst the following actions cannot be classified as simple reflex actions?
1. Dancing 
2. Knee jerk
3. Blinking
4. Coughing

13.

After rise of stimulus for short duration, diffusion of which ions restore resting potential of the membrane at the site of excitation and fibre becomes once more responsive to further stimulation
1. Na⁺ 
2. K⁺
3. Cl^-
4. HCO₃^-

14.

The center of thirst and hunger is located in:
1. Cerebrum
2. Cerebellum
3. Hypothalamus
4. Medulla oblongata

15.

What happens after an excitatory neurotransmitter is released into the synaptic cleft from the presynaptic neuron?
(1) The neurotransmitter activates electrical synapses or gap junctions.
(2) The neurotransmitter opens voltage-regulated Ca2+ channels promoting the influx of calcium ions.
(3) The neurotransmitter binds to specific receptor proteins opening chemically-regulated sodium ion channels.
(4) The neurotransmitters are destroyed by the enzymes released by the postsynaptic neurons.

16.

The vomiting centre is situated in
1.  Cerebrum
2.  Cerebellum
3.  Medulla
4.  Hypothalamus 

17.

Which of the following is not involved in knee-jerk reflex?
1. Muscle spindle
2. Motor neuron
3. Brain
4. Inter neurons

18.

In knee jerk reflex, afferent neuron synapses with motor neuron within
(1) Gray matter of spinal cord
(2) White matter of spinal cord
(3) Gray matter of brain
(4) White matter of brain

19.  Na⁺ - K⁺  pump transports which of the following ions across plasma membrane of neuron ? 
     outside                    Inside 
1. 3 Na⁺                       2 K⁺
2.  2 Na⁺                      3 K⁺ 
3. 3 K⁺                         2 Na⁺ 
4. 2 K⁺                         3 Na⁺ 

20. Dysfunction of which of the following parts of the human brain is most likely to affect learning and memory?
1. Pons
2. Hippocampus
3. Cerebellum
4. Hypothalamus

21. Match each item in Column-I with one in Column-II and select the correct match from the codes given:

	Column-I		Column-II
A.	Peripheral neural system	P.	Comprises of all nerves associated with brain and spinal cord
B.	Somatic neural system	Q.	Relays impulses from CNS to skeletal muscles
C.	Visceral neural system	R.	Transmits impulse from CNS to involuntary organs and smooth muscles
D.	Autonomic neural system	S.	Part of PNS where impulses travel from CNS to the viscera and from the viscera to the CNS

Codes:

	A	B	C	D
1.	P	Q	S	R
2.	Q	R	S	P
3.	R	S	P	Q
4.	S	P	Q	R

22. Consider the given two statements:

I:	The cerebral cortex, referred to as the grey matter, is thrown into prominent folds.
II:	The cerebral white mater contains motor areas, and association area.

 

1.	Both I and II are correct	2.	Both I and II incorrect
3.	Only I is correct	4.	Only II is correct

23. Assertion (A): Myelin sheath is produced by the Schawann cells 
Reason (R):In myelinated nerve fibre, myelin sheath is present throughout
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

24. Nissl’s granules are seen in:
I: Cell body of the neuron
II: Dendrites

1.	Only I	2.	Only II
3.	Both I and II	4.	Neither I nor II

25. Based on the number of axon and dendrites, the neurons are classified as:
I: Multipolar found in the retina of the eye
II: Bipolar found in the cerebral cortex
III: Unipolar found usually in the embryonic stage
IV: Pseudounipolar found in the dorsal root ganglion of the spinal nerve
1. Only I and II are correct
2. Only III and IV are correct
3. I, II, III and IV are correct
4. I, II, III and IV are incorrect

26. There are two types of axons, namely, myelinated and non-myelinated. Find out the correct statement:

I:	The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
II:	Myelinated nerve fibres are found in spinal and cranial nerves.
III:	Unmyelinated nerve fibres are not enclosed by a Schwann cell and a myelin sheath around the axon.
IV:	Unmyelinated nerve fibres are commonly found in autonomous and the somatic neural systems.

 

1.	I, II, IV only	2.	III and IV only
3.	I, II, III and IV	4.	None, All are incorrect

27. The cerebrum wraps around a structure called thalamus, which is:

1.	the highest set of regulation of the functions in human body.
2.	a major coordinating centre for sensory and motor signaling.
3.	involved in decoding the sense of olfaction.
4.	vestigial in human beings.

28. Which of the following is/are controlled by the human brain? 
(a) Balance of the body 
(b) Circadian rhythm of the body 
(c) Human behaviour 
(d) Functioning of heart and kidneys
1. Only (d) 
2. (a) and (d) 
3. (a), (b) and (c) 
4. (a), (b), (c), (d)

29. Depolarisation of neural membranes is caused due to 
1. Rapid influx of Na⁺ ions 
2. Rapid influx of K⁺ ions
3. Rapid efflux of Na⁺ ions  
4. Rapid influx of Cl^- ions 

30. What restores the resting potential of the axonal membrane at the site of excitation after depolarisation?
1. Influx of sodium ions
2. Influx of potassium ions
3. Efflux of sodium ions
4. Efflux of potassium ions