Q. No.Choose the incorrect statement
1. Photoreceptors in the human eye are depolarized in darkness while hyperpolarized during bright light
2. Hypothalamus regulates the body temperature
3. Rhodopsin which is present in rods, a type of photoreceptor cells is a derivative of vitamin C
4. Eustachian tube equalizes pressure on either side of the eardrum
Read the following statements
Statement-A: The retina contains ganglion cells, bipolar cells and photoreceptor cells arranged in sequence from inside to outside.
Statement-B: Light induces potential difference in photoreceptor cells that generates action potential in bipolar cells through ganglion cells
Choose the correct option.
1. Only A is correct
2. Only B is correct
3. Both A and B are correct
4. Both A and B are incorrect
Choose the incorrect statement with respect to the structure marked ‘X’ in the following diagram
1. It is a thin elastic membrane
2. It makes up roof of organ of Corti
3. It is suspended in perilymph
4. It does not contain afferent neurons
Parts A, B, C and D of the human ear are shown in the diagram. Select the option which gives incorrect identification along with its functions /characteristics
|
1. |
A : External ear |
- |
Collects the vibrations in the air |
|
2. |
B : Eustachian tube |
- |
Connects the middle ear cavity with the pharynx |
|
3. |
C : Malleus |
- |
Increase the efficiency of transmission of sound waves |
|
4. |
D : Cochlear nerve |
- |
Carry sensory impulses to the auditory cortex of the brain |
The vibrations produced in the eardrum are transmitted in the following direction
(1) Middle ear → Oval window → Scala media → Round window → Semicircular canal
(2) Ear ossicles → Oval window → Scala vestibuli → Scala tympani → Round window
(3) Ear ossicles → Round window → Scala vestibuli → Scala tympani → Oval window
(4) Middle ear → Oval window → Semicircular canal → Scala media → Scala tympani → Round window
Which of the following represents the fluid-filled space between lens and cornea of the human eye?
1. Cerebrospinal fluid
2. Synovial fluid
3. Vitreous humor
4. Aqueous humor
Match the following columns and select the correct option
| Column-I | Column-II | ||
| a. | The organ of Corti | (i) | Connects the middle ear and pharynx |
| b. | Cochlea | (ii) | Coiled part of the labyrinth |
| c. | Eustachian tube | (iii) | Attached to the oval window |
| d. | Stapes | (iv) | Located on the basilar membrane |
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (i) | (iv) | (ii) |
| 2. | (iv) | (ii) | (i) | (iii) |
| 3. | (i) | (ii) | (iv) | (iii) |
| 4. | (ii) | (i) | (i) | (iv) |
Function of eustachian tube is :-
1. Transfer of sound wave towards internal ear
2. Gives nutrition to ear ossicle
3. Equalising the pressure on either side of tympanum
4. Hearing
Select the option with incorrect combination of the structure with its location and function :-
|
|
Structure |
Location |
Function |
|
(1) |
Corpora quadrigemina |
Mid brain |
Visual and auditory reflexes |
|
(2) |
Thalamus |
Wrapped by cerebrum |
Major co-ordinating centre for sensory & motor signalling |
|
(3) |
Limbic system |
Inner part of cerebral hemisphere |
Emotions, sexual behaviour and motivation |
|
(4) |
Wernick's area |
Frontal lobe |
Sensory auditory area |
1. (1)
2. (2)
3. (3)
4. (4)
Read the following sentences and find out the correct option :-
(1) Wax secreting ceruminous glands found in wall of external auditory meatus
(2) Membranous labyrinth is surrounded by series of channels filled with endolymph
(3) Visual cortex is area of occipital lobe where action potential of olfactory nerve is analysed
(4) Scala vestibuli and scala tympani chambers of ear are terminated at Basilar's membrane
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