The nictitating membrane or plica semilunaris is a vestigial organ and is present in
Important Questions on Neural Control and Coordination
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 |
(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.
Consider the following vision defects listed in Columns I and II and the corrective measures in Column III. Choose the correct combination.
| P. | Hypermetropia | Near-sightedness | a. | Convex lens | |
| Q. | Myopia | (ii) | Far-sightedness | b. | Concave lens |
Draw a neat diagram of the vertical section of the eyeball of human eye and label the following parts:
(a) Choroid (b) Optic nerve (c) Iris (d) Yellow spot
Which statement is CORRECT regarding blind spot in human eye?
It ___________.
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 |
Draw a neat diagram of the vertical section of the eyeball of human eye and label the following parts:
(a) Choroid
(b) Optic nerve
(c) Iris
(d) Yellow spot
Given below are sets of five terms each. Rewrite the terms in correct order in a logical sequence beginning with the first word that is underlined:
Conjunctiva, Yellow spot, Pupil, Vitreous Humour, Aqueous Humour.
