Retina

Q.

Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
(a) Cones: Iodopsin:: Rods: ..............
(b) Sound: Eardrum: Dynamic balance: ..............

Q.

Rod cell: Rhodopsin :: Cone cell : __________

1. carotene

2. melanin

3. photopsin

4. iodopsin

Q.

Dim light: rod cells :: Bright light: ______

1. Cone cells

2. Sensitive cells

3. Photoreceptor cells

4. Circular cells

Q.

The minimum distance for clear vision is

1. 10 cm

2. 20 cm

3. 25 cm

4. 35 cm

Q.

Name the photosensitive pigment present in the rod cells of the retina.

Q.

Which part of the eye has the highest concentration of cones?

Q.

___ which is also known as the sound box which helps in the generation of sound and thus helps us in communicating.

Q.

Rods and cones are found in the ____.

Q.

What is the role of the sclera, aqueous humor, and retina in the eye?

Q.

………. and ………………. cells are the sensory cells in the retina.

Q.

What is the function of each of the following parts of an eye? a. Sclerotic, b. Choroid, c. Retina, d. Iris, e. Rods, f. Cones, g. Optic Nerve.

Q.

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

(a) retina (b) cornea (c) choroid (d) sclera

Q. Which part of the eye contains cells which are sensitive to light?

Q.

The region where the image is sharpest is known as

1. Blind spot

2. Rod region

3. Retina

4. Fovea

Q.

Macula lutea is located in

1. Middle of retina

2. Below Iris

3. Below pupil

4. Below lens

Q. Name the following :​
(ii) Place of no vision in the retina of the eye

Q. Name the following :​
(iv) The circular opening enclosed by iris

Q.

Given below are certain structures. Write against each their special functional activity.
(a) Organ of Corti and ........
(b) Olfactory nerve and ......
(c) Retina and .......

Q.

The image on the retina is always erect and real.

1. False

2. True

Q. Which part of retina consists of cones?

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

Q. State the functions of the following :​
(i) Eyelids

Q. The point in eye of mammals from which optic nerves and blood vessels leave the eye ball is

1. Yellow spot
2. Blind spot
3. None of these
4. Pars optica

Q. Name the following :​
(i) Place of best vision in the retina of the eye

Q.

Impulses from photoreceptors are carried to the brain by

1. Olfactory nerve

2. Auditory nerve

3. Facial nerve

4. Optic nerve

Q.

Rods are very sensitive to low levels of illumination.

1. True

2. False

Q. The figure below compares a part of our eye with a part of a photographic camera. (b) Explain the mode of working and the functions of the parts of the eye mentioned above.

Q.

Choose the correct answer from each of the four options given below:

The part of the human eye where rod and cone cells are located of

1. Retina

2. Cornea

3. Choroid

4. Sclera

Q.

Which nerves enter the eye muscles?

Q. State the functions of the following :​
(iv) Iris

Q.

Give one difference between the blind spot and yellow spot on the basis of sensory cell.