Parts of an Eye

Q.

Which of the following part of the eye is responsible for the focus of light on the retina?

1. Lens

2. Ciliary body

3. Ciliary muscle

4. Cornea

Q. Assertion (A): An inverted image is formed on the retina but we see images upright.

Reason (R): Brain interprets the visual information and reverses the images.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

Q.

Cornea is covered by a thin membrane called……….

Q. Which gland of the eye produces tears?

1. Vitreous
2. Aqueous
3. Lacrimal
4. Iris

Q.

The change in focal length of an eye lens to focus the image of objects at varying distances is done by the action of the

1. pupil

2. retina

3. ciliary muscles

4. blind spot

Q.

State the main function of yellow spot.

Q. A thin membrane that covers the front portion of the eye is called .

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

Q. Which of the following best describes the nature of our lens?

1. Biconcave, crystalline and stationary
2. Biconvex, crystalline and adjustable
3. Biconvex, opaque and adjustable
4. Biconcave, opaque and stationary

Q. A list of steps involves the mechanism of vision is given below in random order.

1. (vii), (viii), (ii), (vi), (iv), (iii), (v), (i)
2. (i), (ii), (iii), (iv), (v), (vi), (vii), (viii)
3. (viii), (vii), (vi), (v), (iv), (iii), (ii), (i)
4. (i), (iv), (iii), (ii), (vii), (viii), (vi), (v)

Q. Explain the mechanism of vision in human eye.

Q.

Give the special functional activity of iris of the eye.

Q. Impression of an image stays in the retina for:

1. 1/4th of a second
2. 1/8th of a minute
3. 1/16th of a second
4. 1/6th of a minute

Q.

What does the transparent layer covering the exposed part of the eye called?

Q.

The photosensitive pigment present in the cone cells of the retina.

Q. Transmission of light into nerve impulse is a

1. Biological process
2. Biophysical process
3. Mechanical process
4. Chemical process

Q.

The outermost layer that lubricates the eye is called: [1 Mark]

1. Cornea
2. Sclera
3. Conjunctiva
4. Eyelids

Q.

What produces tears in the eye?

1. Eyelid

2. Lacrimal gland

3. Cornea

4. Retina

Q. Boojho was having difficulty in seeing things in dim light. The doctor tested his eyesight and prescribed a particular vitamin supplement. He also advised hint to include a few food items in his diet. Which deficiency disease is he suffering from?

Q. The region of the vertebrate eye, where the optic nerve passes out of the retina, is called the (a) fovea (b) iris (c) blind spot (d) optic chiasma.

Q. Rods and cone cells in the ........... allow light perception and vision.

1. Retina
2. Eyeball
3. Pupil
4. Cornea

Q. What is mean by Accommodation of eye?

Q. Good vision depends on adequate intake of carotene rich food.
Select the best option from the following statements.
A. Vitamin A derivatives are formed from carotene.
B. The photopigments are embedded in the membrane disc of the inner segment.
C. Retinal is a derivative of Vitamin A.
D. Retinal is a light absorbing part of all the visual photopigments.

1. B, C, and D
2. A and B
3. A, C, and D
4. A and C

Q. The part of an eye which acts like a diaphragm of a
photographic camera is

1. pupil
2. Iris
3. Lens
4. Cornea

Q. We fell blinded for a short while entering a dark room when coming from bright light. Why?

Q. Differentiate between tropic and nastic movements.

[Review question: Pg. No: 232]

Q. Ambiguous illusions and distorting illusions are the types of

1. Pathological visual illusions
2. Cognitive illusions
3. Paradox illusions
4. Both A and B

Q. Now can you guess from what distance can an eagle In the sky see a roti on the ground?

Q. Which of the following adjust the size of pupil?

1. Sphincter muscles
2. Iris dilator
3. Opthalmoscope
4. Both A and C

Q. Differentiate between.
Rods and cones

Q. Differentiate between tropic and nastic movements.

[Review question: Pg. No: 232]