Biology
Rima is playing music.
(a) Trace the path of sound of music using following terms:
Pinna, Ossicles, Hammer, Oval window, Cochlea, Eardrum,
(b) Name the nerve that carries the impulse of sound to brain.
Answer
a → Pinna → Eardrum → Hammer → Ossicles → Oval window → Cochlea, b → Auditory nerve
Reason — Sound waves enter the ear through the pinna (the visible part of the ear) and travel through the ear canal (auditory canal). It strikes the eardrum, causing it to vibrate. These vibrations are transmitted to three tiny bones in the middle ear called the ossicles (malleus, incus, and stapes), which amplify the sound. Vibrations pass through the oval window into the fluid-filled cochlea in the inner ear. The movement of fluid in the cochlea stimulates tiny hair cells, which convert the vibrations into electrical signals. These electrical signals are transmitted via the auditory nerve to the brain, where they are interpreted as sound.
Related Questions
The ear ossicle that transports sound vibrations to the inner ear:
- Stapes
- Malleus
- Incus
- Cochlea
Keshav enters a dark room from a brightly lit area. He experiences difficulty in viewing objects, but gradually his vision improves.
Explain the role of the photoreceptors in this case.
Rahul inserted a hairpin into his right ear to remove ear wax. He felt a sudden sharp pain with loss of hearing. This was due to:
- Rupture of eardrum
- Rupture of vestibule
- Rupture of cornea
- Rupture of pinna
Adjusting the focal length of the eye lens to view objects at different distances is done by:
- Cornea
- Iris
- Ciliary muscles
- Sclera