Anatomy of an Eye

Q.

Trace the sequence of events that occur when a bright light is focused on your eyes

Q.

The wall of the eyeball is composed of 3 concentric layers:

1. Sclerotic

2. Lining

3. Choroid

4. Retina

Q.

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

1. only cones are present

2. only rods are present

3. rods and cones are absent

4. special neurons are present

Q.

Erythropenia refers to a condition marked by an abnormal

1. decrease in the number of RBCs

2. increase in the number of RBCs

3. decrease in the number of platelets

4. decrease in the number of WBCs

Q. Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics:

1. D-choroid-its anterior part forms ciliary body
2. A-Retina-contains photo receptors-rods and cones
3. B-Blind spot- has only a few rods and cones
4. C-Aqueous chamber -reflects the light which does not pass through the lens

Q.

Select the odd one among the following.

Sclera, Retina, Rhodopsin, Choroid

1. Sclera

2. Rhodopsin

3. Choroid

4. Retina

Q. (i) Planaria, insects, octopus and vertebrates all have eyes. Can we group eyes of these animals together to establish a common evolutionary origin? Justify your answer. (ii) "Birds have evolved from reptiles" State evidence to prove the statement.

Q.

A thin membrane covering the front part of the eye is

1. Pupil

2. Conjunctiva

3. Retina

4. Iris

Q.

What is the function of eyebrows?

Q.

The region in the eye where rods and cones are located is ___.

1. Sclera

2. Retina

3. Cornea

4. Choroid

Q.

Statement 1: Deafness is caused due to rupturing of the pinna.

Statement 2: Ciliary muscles regulate the size of the pupil.

1. Statement 1 is true and statement 2 is false

2. Statement 1 is false and statement 2 is true

3. Both the statements are true

4. Both the statements are false

Q.

Given below are two sets (a) and (b) of five parts in each. Rewrite them in correct sequence.
(a) Cochlea, tympanum, auditory canal, ear ossicles, oval window.
(b) Conjunctiva, retina, cornea, optic nerve, lens.

Q. The given flowchart shows the different pathways of glucose breakdown. Identify P, Q, R and S.

1. P- Carbon dioxide, Q - Ethanol, R - Lactic acid, S - Pyruvate
2. P- Pyruvate, Q - Carbon dioxide, R - Ethanol, S - Lactic acid
3. P- Lactic acid, Q - Ethanol, R - Pyruvate, S - Carbon dioxide
4. P- Pyruvate, Q - Ethanol, R - Lactic acid, S - Carbon dioxide

Q.

Find the odd one out.

Cornea, Cochlea, Lens, Optic nerve

1. Optic nerve

2. Lens

3. Cochlea

4. Cornea

Q.

Adipose tissue is most abundant in the ___layer under the skin.

Q. Which substance present in blood regulates contractions of stomach

Q.

Which alphabet is a part of our body?

Q.

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

Q.

Cataract can be corrected by using ______

1. convex lens

2. cylindrical lens

3. concave lens

4. biconcave lense

Q.

Why do tears come out of our eyes when we feel depressed?

Q.

Name the structure that is responsible from protecting eyes from sweat.

Q.

Which of the following is not correct for rod cells?

1. Very sensitive to the low level of illumination

2. Stimulated by the wavelength of visible light

3. Mostly located in the centre of retina

4. Regenerates light-sensitive pigment rapidly

Q. What is/are the function of adipose tissue?

1. Fat storing tissue
2. Acts as shock absorber
3. Supporting various part of body
4. Binding together other tissues

Q.

Regeneration of rhodopsin or the purplish pigment in the dark is called

1. After-image

2. Dark adaptation

3. Light adaptation

4. Squint

Q.

Name the photoreceptors found in the retina of the eye.

Q.

Match the following columns and choose the correct option.
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{A. Fovea}& \text{1. Provides opening for entry of light}\\ \text{B. Iris}& \text{2. Provides clearest vision}\\ \text{C. Pupil}& \text{3. Transmits information to CNS}\\ \text{D. Lens}& \text{4. Controls amount of light entering}\\ \text{E. Optic nerve}& \text{5. Focuses light on the retina}\end{array}$

1. A - 1 B - 2 C - 3 D - 4 E - 5

2. A - 2 B - 4 C - 1 D - 5 E - 3

3. A - 5 B - 1 C - 4 D - 3 E - 2

4. A - 4 B - 1 C - 5 D - 2 E - 3

Q.

Choose the correct statement.

1. The choroid layer is richly supplied with blood vessels that nourish the eye

2. The sclerotic layer is richly supplied with blood vessels that nourish the eye

3. The choroid layer is rich in cones and rods

4. The retina is rich in only cones

Q.

Choose the odd one out of the following terms given and name the category to which the others belong.

1. Aqueous humour

2. Vitreous humour

3. Iris

4. Central canal.

Q.

Abnormally increased number of RBCs is called_____________.

1. Leucocythaemia

2. Erythropenia

3. Polycythaemia

4. Leukocytopenia

Q.

Choose the ODD one out of the following terms given and name the CATEGORY to which the others belong:

1. Aqueous humor

2. Vitreous humor

3. Iris

4. Central canal