Rod Cells and Cone Cells

Q.

Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?

Q.

Which photoreceptor is responsible for colour vision of our eye?

1. Rods

2. Cones

3. Both rods and cones

4. None of these

Q. Name two types of cells in the retina of an eye which respond to light.

Q.

Rods allows us to see objects in dim light, while cones let us see colours.

1. True

2. False

Q.

Cone cells are sensitive to dim light.

1. True
2. False

Q.

What is the shape of rods and cones?

1. rods are circular in shape while cones are conical in shape

2. rods are rod shaped, cones are conical

3. rods are cylindrical, cones are spherical

4. they do not have a fixed shape.

Q. Out of rods and cones in the retina of your eye :
(a) which detect colour ?
(b) which work in dim light ?

Q.

(a) What happens to the size of pupil of our eye (i) in dim light (ii) in bright light ?
(b) Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.

Q.

Write the names of the light sensitive pigments present in rods and cones.

Q.

Rod cells are sensitive to light.

1. True
2. False

Q. Nocturnal animals (animals which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this.

Q. Explain why, when it is getting dark at night, it is impossible to make out the colour of cars on the road.

Q.

The pigment produced by the cones is known as?

Q. The human eye is almost spherical in shape.

1. True
2. False

Q.

If the given figure is the image of the retina then in which region are the rods and cones cells distributed?

1. Region A- rods ; Region B - cones

2. Region A- cones ; Region B - rods

3. Region A- both rods and cones ; Region B - nothing

4. Region A- nothing ; Region B - both rods and cones

Q. The dark muscular diaphragm in the human eye that controls the pupil is:

1. Iris
2. Retina
3. Cornea
4. Sclera

Q.

Differentiate rods and cone cells(pigments) on the basis of what is mentioned within brackets.

Q.

What is the function of rods and cone cells?

1. Conversion of light into eletrical cells

2. increase/decrease the focal length of eye lens

3. formation of image

4. conversion of light to heat signals

Q.

If the given figure is the image of the retina then in which region are the rods and cones cells distributed?

1. Region A- cones ; Region B - rods

2. Region A- both rods and cones; Region B - nothing

3. Region A- nothing; Region B - both rods and cones

4. Region A- rods ; Region B - cones

Q. The photoreceptors responsible for the perception of colour are _________.

1. rods
2. cones
3. pupils
4. iris

Q. (a) What happens to the size of pupil of our eye (i) in dim light (ii) in bright light?
(b) Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.

Q.

The light-sensitive cells found on the retina are known as:

1. Rods and cones

2. Iris and pupil

3. Cochlea and pinna

4. Vitreous and aqueous humour

Q. Out of rods and cones in the retina of your eye:
(a) which detect colour?
(b) which work in dim light?

Q. Name two types of cells in the retina of an eye which respond to light.

Q. What are the two photo-receptor cells present in the eye?

1. Rods and pupil
2. Cornea and cones
3. Cones and pupil
4. Rods and cones

Q.

Given below are groups of terms. In each group, the first pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.

Eye: Optic Nerve:: Ear: ......