Retina

Q. Three layers of cells in retina from inside to outside are:

1. Layers of ganglion cells, bipolar cells, photoreceptor cells
2. Layers of ganglion cells, photoreceptor cells, bipolar cells
3. Layers of photoreceptor cells, ganglion cells, bipolar cells
4. Layers of bipolar cells, photoreceptor cells, ganglion cells

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 chaisma

Q. The retinal blood vessels enter the eye at :

1. Fovea
2. Macula lutea
3. Blind spot
4. Crista

Q. In the human eye, the visual acuity is highest at

1. blind spot
2. macula lutea
3. optic disc
4. fovea centralis

Q.

Which one of the following is the correct difference between Rod Cells and Cone Cells of our retina?

1. 1

2. 3

3. 2

4. 4

Q.

Compare the following :

(a) Central neural system (CNS) and Peripheral neural system (PNS)

(b) Resting potential and action potential

(c) Choroid and retina

Q.

The Purplish Red Pigment Rhodopsin contained in the rods type of photoreceptor cells of the Human Eye is a derivative of?

1. Vitamin A

2. Vitamin C

3. Vitamin D

4. Vitamin B1

Q.

Name the most sensitive region of the retina.

Q. In human eye, fovea is the central pit of macula lutea where

1. only rods are present
2. only cones are present
3. optic nerve leaves the eye
4. cones are more than rods.

Q. Choose the correct statement

1. Receptors do not produce graded potentials
2. Nociceptors respond to changes in pressure
3. Meissner's corpuscles are thermoreceptors
4. Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus

Q. Which cells directly transmit action potentials to the optic nerve?

1. bipolar cells
2. cone cells
3. ganglion cells
4. rod cells

Q. The region of vertebrate’s eye where the optic nerve passes out of the retina is called

1. Yellow spot
2. Optic chiasma
3. Blind spot
4. Fovea

Q. The retina is most sensitive at

1. macula lutea
2. optic disc
3. fovea centralis
4. blind spot

Q. When we migrate from dark to light, we fail to see for sometimes but after a time visibility becomes normal. It is an example of

1. Accomodation
2. Adaptation
3. Mutation
4. Photoperiodism

Q. Human eyeball consists of three layers and it encloses

1. Lens, aqueous humor and vitreous humor
2. Cornea, lens, optic nerve
3. Lens, iris, optic nerve
4. Cornea, lens, iris

Q. Identify the vitamin present in rhodopsin.

1. Vitamin-A
2. Vitamin-C
3. Vitamin-B
4. Vitamin-D

Q.

Why is a blind spot called so?

Q. What happens when light falls on a photoreceptor cell?
(i) Retinol dissociates from opsin.
(ii) The structure of opsin changes.
(iii) The membrane permeability changes.

1. i and ii
2. ii and iii
3. iii and iv
4. i and iv

Q. The receptors present in the nose are ______ , perceiving the sense of smell and the receptors on the tongue are ______ , for taste.

1. gustatory, photoreceptor
2. olfactory, gustatory
3. gustatory, olfactory
4. olfactory, photoreceptor

Q. Nocturnal animals, the ones which can see during the night, have abundant________.

1. cones
2. rods
3. fovea
4. blind spot

Q. In the chemistry of vision in mammals, the photosensitive substance is called

1. retinal
2. sclerotin
3. rhodopsin
4. melanin

Q.

What is the exact location of fovea centralis?

Q.

At blind spot, there is no involvement of retinal blood vessels at all.

1. True
2. False

Q. Which cells of the retina enable us to see coloured objects around us?

Q. Find out the right matching from the following pairs :

1. Colour perception …. Cones
2. Binocular vision …. Iris
3. Night blindness …. rods
4. Accommodation …… Pupil

Q. An animal having more cones will be

1. more active during night.
2. more active during day
3. able to see more colours
4. both b and c

Q. The impulses generated during the mechanism of hearing are transmitted to the ______ lobe of the cerebrum

1. occipital
2. frontal
3. parietal
4. temporal

Q. In the chemistry of vision in mammals, the photosensitive substance is called

1. sclerotin
2. retinal
3. rhodopsin
4. melanin

Q. The photosensitive compound in human eye is composed of

1. opsin and retinol
2. opsin and retinal
3. acetylcholine
4. guanine and cytosine

Q.

Can humans see all the colours?