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प्रश्न
Photoreceptor cells are present in __________.
(A) blind spot
(B) retina
(C) cochlea
(D) cornea
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उत्तर
(B) retina
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संबंधित प्रश्न
The number of oscillations per second of a vibrating object is called its time period.
A fluid that occupies the larger cavity of the eye ball behind the lens is
___________.
Give scientific reasons: We cannot distinguish colours in moonlight.
Name the part of the ear associated with hearing.
Name the three tiny bones present in the middle part of ear.
Draw a neat and labelled diagram of the human ear. With the help of this diagram, explain the construction and working of the human ear.
Name the following:
The ear ossicle in contact with the oval window of the inner ear.
The following diagram refers to the ear of a mammal.
(i) Label the parts 1 to 10 to which the guidelines point.
(ii) Which structure:
(a) converts sound waves into mechanical vibrations?
(b) Converts vibrations into nerve impulses?
(c) Responds to change in position?
(d) Transmits impulses to the brain?
(e) Equalizes atmospheric pressure and pressure in the ear.
Complete the following sentence with appropriate Word
The sequence of ear ossicles of vertebrates starting from the tympanum is:
Give reason:
Three small bones of ear ossicles are advantageous as compared to one single bone for hearing.
