The figure shows a diagrammatic representation of the sectional view of cochlea with labels A,B,C and D. Select the option with correct identification and main characteristic or function:-
Important Questions on Nervous System
(i) The rods contain a purplish-red protein called the rhodopsin.
(ii) The photopigments are embedded in the membrane discs of the inner segment.
(iii) Retinal is a derivative of vitamin A.
(iv) Light induces dissociation of the retinal from opsin resulting in changes in the structure of the opsin.
Observe the given steps related to the experience of taste and arrange them properly.
- Impulses reach the brain through the nerves.
- The taste detecting chemoreceptors are stimulated.
- The substances reach the taste buds through saliva.
- Substances responsible for taste dissolves in saliva.
- Forms the experience of taste.
- Impulses form in the chemical receptors.
Match the following columns and select the correct option:-
| Column | column | ||
| (a) | Rods and cones | (i) | Absence of photoreceptor cells |
| (b) | Blind spot | (ii) | Cones are densely packed |
| (c) | Fovea | (iii) | Photoreceptor cells |
| (d) | Iris | (iv) | Visible coloured portion of the eye |
Match the following columns and select the correct option.
| Column-I | Column-II | ||
| (a) | Organ of Corti | (i) | Connects 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 diagrammatic cross section of a single loop of human cochlea is shown in the given figure.
Which one of the following options correctly represents the names of any three of the labelled parts?
The given diagram shows a certain part of a mammalian ear:
(i) Label the parts indicated by guidelines, .
(ii) Which part of the ear is represented?
(iii) Which of the labelled parts (give number only) is concerned with balance and equilibrium?
(iv) Name two main types of ear defects.
1. The sensory cells that helps in hearing.
2. The part that is responsible for static balance of the body.
3. The membrane covered opening that connects the middle ear to the inner ear.
4. The fluid present in the middle chamber of cochlea.
5. The structure that maintains dynamic equilibrium of the body.
