Question

Mention if the fallowing statements are true (T) or false (F). Give reason.
(a) Sometimes medicines dropped into the eyes come into the nose end even throat. (T/F)
(b) Ciliary muscles regulate the size of the pupil. (T/F)
(c) Yellow spot of the retina is the region of colour vision. (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 arc one and the same thing. (T/F)
(g) Short-sightedness and hyperopia are one and the same thing. (T/F)
(h) Blind spot is called so because no image is formed on it. (T/F)

Answer 1

(a) Sometimes medicines dropped into the eyes come into the nose end even throat this statement is true.

In our eye, there is a drainage hole in the inner corner of the eye this drainage hole is called as lacrimal punctum or puncta. It drains the excess water from eyes into the nose or throat (i.e., back of the mouth). And hence sometimes medicines dropped into the eyes come into the nose end even throat this statement is true.

(b) Ciliary muscles regulate the size of the pupil, this statement is false.

As ciliary muscles regulate the size of the lens and not the size of the pupil.

(c) The yellow spot of the retina is the region of color vision, this statement is true.

Yellow spot is also known as the macula, it is the area where the light information is concentrated on the retina, this area has the sharpest vision. It is the area of best vision where the maximum amount of cone cells are present. Hence yellow spot of the retina is the region of color vision.

(d) The auditory nerve .is purely for perceiving sound, this statement is false.

As the auditory nerve is also responsible for the body balance apart from perceiving sound.

(e) Malleus, incus, and stapes are collectively called the ear ossicles, this statement is true.

Our ear has a part called ossicles in the middle ear. the middle ear ossicles have hammer, anvil, and stirrup also known as malleus, incus, and stapes.

(f) Flavor and taste are one and the same thing, this statement is false.

As flavor is a combination of taste and smell.

(g) Short-sightedness and hyperopia are one and the same thing, this statement is false.

As short-sightedness is myopia and hyperopia is long-sightedness.

(h) The blind spot is called so because no image is formed on it, this statement is true.

The junction of the retina and the optic nerve is known as the blind spot. The blind spot don't have photoreceptors (i.e., rods and cones) present in it. Hence the blind spot is called so because no image is formed on it