Neural Control and Coordination Test

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Neural Control and Coordination Test - 57

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following has H-shaped grey matter?

A
Cerebrum

B
Medulla oblongata

C
Cerebellum

D
Spinal cord

Solution

D. Spinal cord
Reason: The spinal cord has a central canal, gray matter and white matter with centrally located H-shaped gray matter. It contains numerous cell body and few myelinated axon. Here ventral horns of H are broader than dorsal horns. In case of brain, the gray matter forms the outer layer and is mainly composed of cell bodies of neurons. The inner layer is composed of white matter. It contains axons that join to form nerves. So the correct option is D.
Question 2
1 / -0

Comprehension of spoken and written words take place in the region of

A
Association area

B
Motor area

C
Wernicke's area

D
Broca's area.

Solution

The posterior left hemisphere of the brain cortex at the sylvian fissure is known as Wernicke's area, where comprehension of spoken and written words take place.
So, the correct option is C.
Question 3
1 / -0

The innermost layer the human eye is

A
Chroid

B
Cornea

C
Sclera

D
Retina

Solution

The light that enters the eyes through the lens is focused on the retina. The retina is like a screen, it contains light perceiving neurons - the rods and the cones that transmit the image in the form of electrical impulses to the brain.
So, the correct answer is 'Retina'
Question 4
1 / -0

The Broca's area and Wernicke's centre are the association areas situated in cerebrum. These are associated with ___________.

A
breathing

B
blind spot

C
memory

D
none of these.

Solution

Broca's area is the motor speech area and Wernicke's area plays role in understanding speech and writing words.

Question 5

1 / -0

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

Column I	Column II
A. Cornea	(i) Provides opening for light to enter
B. Iris	(ii) Transduces blue, green and red light
C. Lens	(iii) Controls the amount of light that enters
D. Optic nerves	(iv) Alters the shape of lens
E. Pupil	(v) Transmit information to the CNS
F. Ciliary muscles	(vi) Focus light directly on retina
G. Fovea	(vii) Bends light and protects inner eye

A - (vii), B - (iii), C - (vi), D - (v), E - (i), F - (iv), G - (ii)

A - (i), B - (ii), C - (iii), D - (iv), E - (v), F - (vi), G - (vii)

A - (vii), B - (vi), C - (v), D - i(v), E - (iii), F - (ii), G - (i)

A - (vii), B - (iv), C - (vi), D - (v), E - (i), F - (iii), G - (ii)

Solution

A. A-(vii), B-(iii), C-(vi), D-(v), E-(i), F-(iv), G-(ii)

Reason:

Cornea bends the light and protects inner eye from the environment.
Iris controls the amount of light that enters into the eye.
Lens focuses light directly on retina and forms a proper image.
Optic nerve transmits information to the CNS for analysing.
Pupil provides opening for light to enter into the inner eye.
Ciliary muscles alters the shape of lens to adjust the focus.

Fovea transduces blue, green and red light.

So the correct option is A.

Question 6
1 / -0

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.

A
(ii), (iv) and (v)

B
(i) and (ii)

C
(iv) only

D
(i), (v) and (vi)

Solution

At electrical synapse, the transfer of impulse occurs by purely electrical means without involving any neurotransmitter.
So, the correct option is C.
Question 7
1 / -0

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

A
Resting potential

B
Action potential

C
Spike potential

D
Reaction potential

Solution

The electrical potential difference between outside and inside of a nerve fibre before excitation (polarized nerve fibre) is known as resting potential whose value is $$-70$$ mV.
Question 8
1 / -0

Cornea transplant in humans is almost never rejected. This is because ______________.

A
It is composed of enucleated cells

B
It is a non -living layer

C
Its cells are least penetrable by bacteria

D
It has no blood supply
Solution
Correct Option: D
Explanation:
The cornea is a transparent part of the eyeball that makes up the anterior one-sixth of the eyeball.
As light waves reach the eye, the cornea allows them and helps to focus them.
The cornea lacks blood vessels (i.e., gets no blood supply).
This portion of the eye collects oxygen from the surrounding environment.
Because there is no blood supply, cornea transplants in humans are nearly never rejected.
It was one among the first organs to be transplanted successfully.
Hence, cornea transplant in humans is almost never rejected because it has no blood supply.
Question 9
1 / -0

Rhodopsin is found in

A
Rods only

B
Whole of retina

C
Cones only

D
Ganglion cells

Solution

Rhodopsin is found in specialized light receptor cells called rods. These are light-sensitive tissue present in the retina. They provide vision in low light. Other light receptor cells in the retina, called cones, are responsible for vision in bright light.
Thus, the correct answer is 'rods only.'
Question 10
1 / -0

Which of the following is transparent in nature?

A
Conjuctiva

B
Cornea

C
Iris

D
Both A and B

Solution

A. Conjunctiva is a transparent membrane that lines the eyelids. It protects the delicate cornea.
B. Cornea is a transparent layer that forms the front of eyes. It is the anterior portion of sclera, a dense connective tissue which maintains the shape of eye and also protects it.
C. Iris is an opaque and pigmented structure in the eye. It controls the size of pupil and thus, regulates amount of light entering the eye.
Hence, conjunctiva and cornea are transparent. So, both options A and B are correct.
So, the correct answer is 'Both A and B'.

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Neural Control and Coordination Test - 57

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Neural Control and Coordination Test - 57

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Question 1

Cerebrum

Medulla oblongata

Cerebellum

Spinal cord

Solution

Question 2

Association area

Motor area

Wernicke's area

Broca's area.

Solution

Question 3

Chroid

Cornea

Sclera

Retina

Solution

Question 4

breathing

blind spot

memory

none of these.

Solution

Question 5

A - (vii), B - (iii), C - (vi), D - (v), E - (i), F - (iv), G - (ii)

A - (i), B - (ii), C - (iii), D - (iv), E - (v), F - (vi), G - (vii)

A - (vii), B - (vi), C - (v), D - i(v), E - (iii), F - (ii), G - (i)

A - (vii), B - (iv), C - (vi), D - (v), E - (i), F - (iii), G - (ii)

Solution

Question 6

(ii), (iv) and (v)

(i) and (ii)

(iv) only

(i), (v) and (vi)

Solution

Question 7

Resting potential

Action potential

Spike potential

Reaction potential

Solution

Question 8

It is composed of enucleated cells

It is a non -living layer

Its cells are least penetrable by bacteria

It has no blood supply

Solution

Question 9

Rods only

Whole of retina

Cones only

Ganglion cells

Solution

Question 10

Conjuctiva

Cornea

Iris

Both A and B

Solution

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