Cells and Tissues of Eye

Q.

Why iris is in different colors for different people?

Q. The area of retina in human eye which contains the maximum number of cone cells is:

1. Macula
2. Yellow spot
3. Blind spot
4. Fovea centralis

Q.

What is vitreous chamber?

Q. Area of the retina where there are no photoreceptor cells is called ______.

1. cornea
2. yellow spot
3. iris
4. blind spot

Q.

Given below is the set of four terms in which one is odd. Identify the odd one in each set and name the category to which remaining three belong.

1. Haemoglobin

2. Glucagon

3. Iodopsin

4. Rhodopsin

Q. Assertion [A]: Owls have a better night vision.

Reason [R]: Owl eyes are dominated by cones.

1. A is True and R is False
2. R is True and A is False
3. Both A and R are true and R is a correct explanation for A.
4. Both A and R are true but R is not a correct explanation to A

Q. The pigment rhodopsin present in the rod cells is necessary for colour vision.

1. True
2. False

Q.

Mark the odd item in each series:

Incus; stapes; retina; malleus.

Q. Which pigment gives colour vision?

1. Hemoglobin
2. Rhodopsin
3. Melanin
4. Iodopsin

Q.

Blind spot in an eye is located

1. in fovea centralis

2. in middle of the lens

3. where optic nerve leaves the retina

4. in the center of the pupil

Q.
Why do owls have better night vision than day vision?

Q. In mammals, the point in the eye from which optic nerves and blood vessels leave the eyeball is known as ______ .

1. blind spot
2. iris
3. cornea
4. retina

Q. Several statements are given here in reference to cone cells which of the following option indicates all correct statements for cone cells?
Statements
(i) Cone cells are less sensitive in bright light than Rod cells
(ii) They are responsible for colour vision
(iii) Erythropsin is a photo pigment which is sensitive to red colour light
(iv) They are present in fovea of retina.

1. (iii), (ii) and (i)
2. (ii), (iii) and (iv)
3. (i), (iii) and (iv)
4. (i), (ii) and (iv)

Q. Which one is correct difference between rod and cone cells?

		Rod cells	Cone cells
(A)	Overall function	Vision in poor light	Colour vision and detailed vision in bright light
(B)	Distribution	More concentrated in centre of retina	Evenly distributed all over retina
(C)	Visual activity	High	Low
(D)	Visual pigment	Iodopsin	Rhodopsin

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

Q.

Which part of the body is associated with the lacrimal bone?

1. Eyes

2. Ear

3. Throat

4. Chin

Q.

Why lack of melanin in iris results in blue colour iris?

Q.

Name the process/term for the following statements:

The cells of retina which differentiate colours.

Q. Chief functions of the rods and cones in the eye of a vertebrate

1. Rods are important for vision in dim light and cones in bright light
2. Rods are important for vision in bright light and cones in dim light.
3. Rods are involved in colour vision and cones in distinguishing intensities of light.
4. Rods and cones are both important for vision in dim light

Q. As compared to rods, the cones are ............... times less sensitive to light.

1. 100
2. 200
3. 400
4. 300

Q. Why we usually do not see bright colours in dim light?

Q. Animals which see well during night have abundant _______.

1. Rods
2. Cones
3. Scotopic cells
4. Night vision cells

Q. Assertion :Owls can move freely during night. Reason: They have large number of rods in their retina.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Assertion :Vitamin A deficiency produces night blindness. Reason: Photosensitve pigment rhodopsin is synthessised from vitamin A.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Fill in the blanks :
___ cells enables us to see in dimlight.

Q. Rod cells are able to function in low light intensity.

1. True
2. False

Q. Differentiate between the following on the basis of what is given in brackets.
Rod cells and Cone cells(pigment).

Q. .......... pigment enables us to see in the dark.

Q. Owls move freely during night since they have

1. Adjustable pupil
2. Only cones in retina
3. Vitamin A deficiency
4. Only rods in retina

Q. Find the correctly matched pair from the following :

1. Rods - Iodopsin
2. Cones - Rhodopsin
3. Iodopsin - Low intensities of light
4. Rhodopsin - Helps to see in dark

Q. Only rods are present in the eyes of which one of the following animals?

1. Pigeon
2. Squirrel
3. Fowl
4. Owl