Q3 of 102 Page 130

Mention, where in living the following located and state their main functions:
(a) Fovea centralis

(b) Organ of Corti

(a) ● Fovea centralis is located at the back of the eye almost at the center of the eyeball.

● It is the region of the brightest vision and also of the color vision.

(b) ● Organ of Corti is located in the inner ear.

● It contains sensory cells which process hearing.

Differentiate between members of each of the following pairs with reference to what is asked in brackets.

Dynamic balance and static balance (Definition)

State whether the following statements are true (T) or false (F). If false, correct them by changing any one single word in each.

(a) Deafness is caused due to rupturing of the pinna. (T/F)

(b) Semicircular canals are concerned with static (positional) balance. (T/F)

Mention if the following statements are true (T) or false (F). Give reason.

(a) Sometimes medicines dropped into the eyes come into the nose and even throat. (T/F)

(b) Ciliary muscles regulate the size of the pupil. (T/F)

(d) The auditory nerve is purely for perceiving sound. (T/F)

(e) Malleus, incus, and stapes are collectively called the ear ossicles. (T/F)

(f) Flavour and taste are one and the same thing. (T/F)

(g) Short-sightedness and hyperopia are one and the same thing. (T/F)

(h) The blind spot is called so because no image is formed on it. (T/F)

Given below are two sets (a) and (b) of five-part in each. Rewrite them in the correct sequence.

(a) The cochlea, tympanum, auditory canal, ear ossicles, oval window.

(b) Conjunctiva, retina, cornea, optic nerve, lens.

Questions · 102

9. The Nervous System

1 2 1 2 3 1 2 3 1 1 1 1 2 3 1 2 3 3 1 3 3 4 5 6 6 6 6 6 7 1 1 2 3 4 5 6 1 2 3 1 2 3 4 1 2 3 4 5 6 1 2 3 4 1 1 1 1 1 1 1 1 1 2 3 1 1 1 1 1 2 3 4 5 6 6 6 6 7 7 7 7 7 8 9 10 11 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8

Mention, where in living the following located and state their main functions:(a) Fovea centralis(b) Organ of Corti