Parts of the Eye

Q. Trace the correct sequence for pathway of light through the eye to the retina?

1. Conjunctiva - Cornea - Aqueous humour - Pupil Lens - Vitreous humour - Yellow spot
2. Cornea- Conjunctiva- Vitreous humour- Lens- Pupil - Aqueous humour - Yellow spot
3. Conjunctiva- Cornea - Vitreous humour - Lens - Pupil - Aqueous humour - Yellow spot
4. Cornea - Conjunctiva - Aqueous humour - Pupil- Lens - Vitreous humour - Yellow spot

Q.

What are ommatidia?

Q.

Human eyeball consists of three layers and it encloses

(a) lens, iris, optic nerve

(b) lens, aqueous humour and vitreous humour

(c) cornea, lens, iris

(d) cornea, lens, optic nerve

Q.

Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?

Q. Three layers in the eye ball from outside to inside are:

1. Retina, choroid, sclerotic.
2. Choroid, retina, sclerotic.
3. Sclerotic, retina, choroid.
4. Sclerotic, choroid, retina.

Q.

What is a yellow spot?

Q. The space between the cornea and the lens is called______________

1. vitreous chamber
2. aqueous chamber
3. vitreous humor
4. aqueous humor

Q.

The chemical formula of tear gas is_____

Q.

The fovea is the point where visual activity is greatest. In Fovea:

1. cones are more in number.

2. only rods are densely packed

3. only cones are densely packed.

4. Both rods and cones are densely packed.

Q. In the blind spot, where the optic nerves leave the eyes

1. Only cones are present
2. rods and cones are absent
3. Only rods are present
4. Special neurons are present

Q.

Briefly describe the structure of the following:

(a) Brain (b) Eye (c) Ear

Q. The middle layer of the eye ball is

1. sclera
2. choroid
3. cornea
4. retina

Q.

What are the anatomical factors causing corneal transparency?

Q. The neural impulses transmitted by the optic nerve are analysed and the image formed on the retina is recognised based on earlier _______ and _______.

1. signals, impulses
2. experience, memory
3. signals, stimulus
4. experience, impulses

Q.

Name the enzyme present in tears that prevents eye infections.

Q. Which part of the human ear does not play a major role in hearing as such but is otherwise very much required?

1. Organ of Corti
2. Ear ossicles
3. Eustachian tube
4. Vestibular apparatus

Q.

What are the photopigments present in the human eye composed of?

Q. Cornea transplant in humans is almost never rejected. This is because:

1. It is composed of enucleated cells
2. It is a non-living layer
3. Its cells are least penetrable by bacteria
4. It has no blood supply

Q. Three layers in the eye ball from outside to inside are:

1. Retina, choroid, sclerotic.
2. Choroid, retina, sclerotic.
3. Sclerotic, retina, choroid.
4. Sclerotic, choroid, retina.

Q. Foramen of Magnum is present in :

1. Base of medulla
2. Base of skull
3. Apex of vertebral
4. Base of brain

Q. Which of the following statements is incorrect?

1. Human eye adjusts the amount of light entering the eye by contracting the muscles of the iris.
   
2. Human eye focuses light by moving the lens closer to or farther from the retina.
3. The cornea participates in focussing of light.
4. The lens is held in place by ligaments attached to the ciliary body.

Q. Assertion: Inflammation of a skeletal joint may immobilize the movements of the joint.

Reason: Uric acid crystals in the joint cavity and ossification of articular cartilage lead to this.

1. If both assertion and reason are true and reason is the correct explanation of assertion
2. If both assertion and reason are true but reason is not the correct explanation of assertion
3. If assertion is true but reason is false
4. If both assertion and reason are false

Q. Complete the analogy w.r.t. internal structure of human eye.
Anterior portion of sclera : Cornea:: _______ : Ciliary body

1. Posterior portion of choroid
2. Posterior $\frac{2}{3}rd$ of sclera
3. Posterior $\frac{1}{3}rd$ of sclera
4. Anterior portion of choroid

Q. Identify the parts ‘a’ ‘b’ and ‘c’ in the figure below.

1. a- retina, b-choroid, c- Sclera
2. a- choroid, b-retina, c- sclera
3. a- sclera, b-choroid, c- retina
4. a- sclera, b-retina, c- choroid

Q. Which part of retina consists of only cones?

1. Fovea centralis
2. Optic nerve
3. Blind spot
4. Chiasmata

Q. Match each item in Column 1 with one item in Column 2 and choose your answer from the options given below:
$\begin{array}{cc}\text{Column 1}& \text{Column 2}\\ \text{p. Retina}& \text{i. Accommodation}\\ \text{q. Cornea}& \text{ii. Site at which image is formed}\\ \text{r. Iris}& \text{iii. Major refraction surface}\\ \text{s. Ciliary body}& \text{iv. Regulation of pupil size}\end{array}$

1. p-i, q-iii, r-iv, s-ii
2. p-ii, q-iii, r-iv, s-i
3. p-iii, q-iv, r-i, s-ii
4. p-iv, q-iv. r-ii, s-i

Q.

The image type formed in the eyes of a cockroach is?

1. Superposition

2. Apposition

3. Both A and B

4. None of these

Q. Charateristics character of human cornea is:

1. Secreted by conjuctiva and glandular
2. It has lacrimal gland which secrete tears
3. Blood circulation is absent in cornea
4. In old age it hardens and a white layer deposit on it, which results in cataract

Q. What is the function of the fluid present in the part labelled as ‘a’ in the given figure.

1. Maintains the pressure within the eye.
2. Both b and c
3. Transmits light to retina
4. Supports the shape of the lens

Q. Which of the following is not the part of the eye?

1. Fovea
2. Corpora quadrigemina
3. Blind spot
4. Pupil