Neural Control and Coordination Test 12

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Neural Control and Coordination Test 12

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Weekly Quiz Competition

Question 1
1 / -0

Following is the diagram of an eye. Match the labelled parts (A - J) with their functions given below and select the correct option.

(i) Carries nerve signals to the brain
(ii) Regulates the size of the pupil to let more or less light into the eye
(iii) Changes the shape of the lens
(iv) Photoreceptors are concentrated at this point

A
(i)-B, (ii)-D, (iii)-F, (iv)-H

B
(i)-J, (ii)-G, (iii)-I, (iv)-C

C
(i)-A, (ii)-C, (iii)-E, (iv)-G

D
(i)-G, (ii)-D, (iii)-C, (iv)-E

Solution

G' is optic nerve, 'D' is iris, 'C' is ciliary body, 'E' is fovea centralis.
Question 2
1 / -0

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

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

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

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

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

Solution

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 3
1 / -0

The part of the ear where sound is transduced is

A
tympanic membrane

B
ear ossicles

C
semicircular canals

D
Cochlea

Solution

Cochlea is the main hearing organ. The transformation of the vibration into nerve impulses for relay to the brain takes place here.
Question 4
1 / -0

The structures in a human body that assist in body balance are located in the

A
outer ear

B
middle ear

C
inner ear

D
Eustachian tube

Solution

Cristae and maculae, the structures concerned with balance are located in the inner ear.
Question 5
1 / -0

Bony labyrinth is filled with a fluid called

A
endolymph

B
perilymph

C
hololymph

D
juxtalymph

Solution

Internal ear (membranous labyrinth) is surrounded by an almost similar shaped bony labyrinth. The membranous labyrinth is joined to the bony labyrinth at certain points, but its greater part is separated from the bony labyrinth by a narrow perilymphatic space. This space is filled with a watery fluid called perilymph that closely resembles cerebrospinal fluid
Question 6
1 / -0

Eustachian tube is a passage connecting the

A
inner ear with pharynx

B
eye with nose

C
middle ear with pharynx

D
middle ear with eye

Solution

Tympanic cavity (part of middle ear) is an air filled cavity that is connected with the nasopharynx through Eustachian tube. It serves to equalise the air pressure in the tympanic cavity with that on the outside
Question 7
1 / -0

A small passage that permits continuity between scala vestibuli and scala tympani is ___________.

A
Helicotrema

B
Eustachian tube

C
Cochlea

D
Vestibule

Solution

Both the scala vestibuli and scala tympani are connected with each other at the apex of the cochlea by a small canal called helicotrema.
Question 8
1 / -0

In the chemistry of vision in mammals, the photosensitive substance is called

A
rhodopsin

B
melanin

C
sclerotin

D
retinol

Solution

Rhodopsin is a pigment present in the rod cells of the retina. It consists of two components-opsin and retinal (= retinene). Retinal is an aldehyde of vitamin A which absorbs light falling on the rod and changes its form and separates from the opsin component. This initiates the transmission of a nerve impulse to the brain. Rhodopsin is a photosensitive substance and allows vision in dim light (night vision).
Question 9
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

Cornea is a transparent layer of tissue continuous with sclerotic that forms the front part of vertebrate eye over the iris and lens. It refracts light waves entering the eye onto lens. Cornea is avascular (i.e., has no blood supply). It is one of the first organs to be successfully transplanted because it lacks blood vessels.
Question 10
1 / -0

The black pigment in the eye, which reduces the internal reflection, is located in

A
retina

B
iris

C
sclerotic

D
cornea

Solution

The black pigment, melanin in the eye, which reduces the internal reflection is located in the pigment layer of retina.
Question 11
1 / -0

Examine the diagram of the two cell types A and B given below and select the correct option

A
Cell A is the rod cell found evenly all over retina

B
Cell A is the cone cell more concentrated in the fovea centralis

C
Cell B is concerned with colour vision in bright light

D
Cell A is sensitive to low light intensities

Solution

Cone cells are light sensitive cells, located in the retina of the eye. Fovea centralis is the area of greatest concentration of cones in retina.
Question 12
1 / -0

The balancing organ of ear is

A
lagena and sacculus

B
semicircular canal and utriculus

C
semicircular canal and ossicles

D
otolith and lagena

Solution

Semicircular canal, sacculus and utriculus are receptors of equilibrium or balancing organs of ear.
Question 13
1 / -0

The shape of eye lens is changed by

A
pupil

B
iris

C
optic nerve

D
ciliary muscle

Solution

Ciliary muscles are circular sheet of smooth muscle fibres present within the ciliary body. These muscles alter the shape of the lens during contraction.
Question 14
1 / -0

Protein found in eye lens is

A
crystalline

B
collagen

C
opsin

D
rhodopsin

Solution

Proteins found in eye lens are crystallins which are transaprent proteins.
Question 15
1 / -0

Which of the following cells are associated with identification of colours in bright light?

A
Cone cells

B
Rod cells

C
Lacrimal cells

D
Cells of Muller

Solution

Cone cells are chiefly concerned with distinction colour and light vision during day time.
Question 16
1 / -0

The size of pupil is controlled by the

A
ciliary muscles

B
suspensory ligaments

C
cornea

D
iris muscles

Solution

The size of pupil is controlled by two types of muscles of iris, circular muscles and radial muscles. Radial muscles contract in dim light and circular muscles contract in bright light.
Question 17
1 / -0

Cornea is covered externally by a thin transparent membrane which is called

A
Sclerotic

B
conjunctiva

C
choroid

D
none of these

Solution

Cornea is covered externally by a thin transparent membrane called conjunctiva. This membrane helps to protect the eye ball and keeps it moist.
Question 18
1 / -0

The gelatinous membrane covering the sensory hair cells of the ear is known as

A
Reissner's membrane

B
Tectorial membrane

C
Basilar membrane

D
Neuro-sensory membrane

Solution

Tectorial membrane is a gelatinous membrane covering the sensory hair cells in the scala media of cochlea.
Question 19
1 / -0

Retina of eye is analogous to which part of camera?

A
film

B
lens

C
shutter

D
glass

Solution

Retina of our eye is analogous to the light sensitive film of camera.
Question 20
1 / -0

The point in eye of mammals from which optic nerves and blood vessels leave the eye ball is called

A
yellow spot

B
blind spot

C
pars optica

D
green spot

Solution

Blind spot lies close to the yellow spot of the eye and lacks receptor cells (rods and cones) because the optic nerves leave the eye ball from here.
Question 21
1 / -0

Internal ear is filled with

A
Perilymph

B
Endolymph

C
Lymph

D
Both A and B

Solution

Internal ear consists of two divisions:
(i) bony labyrinth, filled with fluid called perilymph
(ii) membranous labyrinth, filled with fluid called endolymph
Question 22
1 / -0

The fluid filled in the space between lens and cornea is termed as

A
vitreous humour

B
aqueous humour

C
synovial fluid

D
CSF

Solution

Aqueous humour is a watery, alkaline liquid filling the anterior compartment of the eye. It is present between the cornea and the lens. It maintains the shape of the cornea and supplies nutrition to both lens and cornea.
Question 23
1 / -0

Select the option that correctly matches the structures with its location and function.

A
a

B
b

C
c

D
d
Question 24
1 / -0

The innermost layer of the human eye

A
Choroid

B
Cornea

C
Sclera

D
Retina

Solution

The innermost layer of the human eye is retina which is a light sensitive layer. It consists of rods and cones.
Question 25
1 / -0

Retina is most sensitive at

A
macula lutea

B
optic disc

C
fovea centralis

D
periphery

Solution

As fovea centralis contains a large number of cones only, therefore, it is a point of great visual acuity in retina.

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Neural Control and Coordination Test 12

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Question 1

(i)-B, (ii)-D, (iii)-F, (iv)-H

(i)-J, (ii)-G, (iii)-I, (iv)-C

(i)-A, (ii)-C, (iii)-E, (iv)-G

(i)-G, (ii)-D, (iii)-C, (iv)-E

Solution

Question 2

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−(iv), E−(iii), F−(ii), G−(i)

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

Solution

Question 3

tympanic membrane

ear ossicles

semicircular canals

Cochlea

Solution

Question 4

outer ear

middle ear

inner ear

Eustachian tube

Solution

Question 5

endolymph

perilymph

hololymph

juxtalymph

Solution

Question 6

inner ear with pharynx

eye with nose

middle ear with pharynx

middle ear with eye

Solution

Question 7

Helicotrema

Eustachian tube

Cochlea

Vestibule

Solution

Question 8

rhodopsin

melanin

sclerotin

retinol

Solution

Question 9

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 10

retina

iris

sclerotic

cornea

Solution

Question 11

Cell A is the rod cell found evenly all over retina

Cell A is the cone cell more concentrated in the fovea centralis

Cell B is concerned with colour vision in bright light

Cell A is sensitive to low light intensities

Solution

Question 12

lagena and sacculus

semicircular canal and utriculus

semicircular canal and ossicles

otolith and lagena

Solution