Iris

Q.

A dark muscular diaphragm that controls the size of the pupil is ______.

1. Iris

2. Cornea

3. Ciliary muscle

4. Aqueous humour

Q.

Which part of the human eye is responsible of rendering different eye colour for different human beings?

1. pupil

2. iris

3. lens

4. cornea

Q.

What is the function of iris?

1. It focuses light on retina.

2. It controls the size of pupil.

3. It controls ciliary muscles.

4. It controls the size of cornea.

Q.

What is an iris and where is it located?

1. It is transparent bulge, located behind cornea.

2. It is a transparent medium, located behind retina.

3. It is a dark muscular diaphragm, located behind cornea.

4. It is a dark muscular diaphragm, located infront of cornea.

Q. We all have observed that some people have black eyes, some brown and some light blue. What part of the eye gives it colour?

1. Crystalline lens
2. Cones
3. Cornea
4. Iris

Q.

Which part of the eye is donated after death?

Q. Suggest how your irises help to protect the retinas of your eyes from damage by bright light.

Q.

The _____ appears black because no light is reflected from it.

Q. Which of the following parts of the eye is similar to the diaphragm in the camera?

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

Q.

We all have observed that some people have black eyes, some brown and some light blue. What part of the eye gives it its colour?

1. Crystalline lens

2. Cones

3. Iris

4. Cornea

Q. Which of the following controls the amount of light entering the eye ?
(a) ciliary muscles (b) lens (c) iris (d) cornea

Q.

Match the following in most appropriate way:
$\begin{array}{cc}\text{Part of eye}& \text{Function}\\ a)\text{Iris}& p)\text{Converts the light}\\ & \text{into neural signals,}\\ & \text{and send these}\\ & \text{signals on to the brain}\\ & \text{for visual recognition}.\\ b)\text{Pupil}& q)\text{Primarily focuses}\\ & \text{and controls the}\\ & \text{entrance of light}\\ & \text{into the eye.}\\ c)\text{Retina}& r)\text{Controls size of}\\ & \text{pupil and amount}\\ & \text{of light reaching}\\ & \text{the retina.}\\ d)\text{Cornea}& s)\text{Focuses light onto}\\ & \text{the retina and help}\\ & \text{the eye to focus on}\\ & \text{objects at different}\\ & \text{distances.}\end{array}$

1. a-s, b-r, c-t, d-p, e-q

2. a-r, b-s, c-p, d-t, e-q

3. a-r, b-s, c-t, d-q, e-p

4. a-s, b-r, c-p, d-t, e-q

Q. In the human eye, the opaque diaphragm behind the cornea is called the

1. Choroids
2. Iris
3. Retina
4. lens

Q. Assertion :The eye is said to have power of accomodation . Reason: Ciliary muscles alters the shape of the lens for near or far vision during accomodation.

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.

Why does it take some time to see the surroundings clearly in a dark cinema hall when a person enters from the bright sunlight?

Q.

Given below are sets of 5 terms each. Rewrite the terms in the correct order in a logical sequence.

Pupil, Yellow spot, Cornea, Lens, Aqueous humour (Path of light into eye from an object)

Q. We all have observed that some people have black eyes, some brown and some light blue. Which part of the eye gives the eye colour?

1. Crystalline lens
2. Iris
3. Cones
4. Cornea

Q.

Name the process or term for the following statement:

A pigmented circular area in the eye

Q.

Which part of the human eye is responsible of rendering different eye colour for different human beings?

1. pupil

2. iris

3. lens

4. cornea

Q. The capacity of a normal human eye to see the smallest objects is :

1. 5000 nm
2. 18000 nm
3. 10000 nm
4. 25000 nm

Q. We all have observed that some people have black eyes, some brown and some light blue. Which part of the eye gives the colour?

1. Crystalline lens
2. Cones
3. Cornea
4. Iris

Q. In the figure of the human eye, the cornea is represented by the letter :

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

Q.

What is the function of iris?

1. It focuses light on retina.

2. It controls the size of pupil.

3. It controls ciliary muscles.

4. It controls the size of cornea.

Q.

Name the part of the eye :
(a) which controls the amount of light entering the eye.
(b) on which the image is formed.
(c) which changes the focal length of eye-lens.

Q. The size of the pupil of the eye is adjusted by :
(a) cornea (b) ciliary muscles (c) optic nerve (d) iris

Q. Which of the following parts of the eye is similar to the diaphragm in the camera?

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

Q.

Match the following in most appropriate way:
$\begin{array}{cc}Partofeye& Function\\ a)Iris& p)Convertsthelightintoneuralsignals,andsends\\ & thesesignalsontothebrainforvisualrecognition.\\ b)Pupil& q)Primarilyfocusesandcontrolstheentranceof\\ & lightintotheeye.\\ c)Convexlens& r)Regulatestheamountoflightreachingtheretina.\\ d)Retina& s)Controlssizeofpupilandamountoflightreaching\\ & theretina.\\ e)Cornea& t)Focuseslightontotheretinaandhelpstheeyeto\\ & focusonobjectsatdifferentdistances.\end{array}$

1. a-s, b-r, c-t, d-p, e-q
2. a-r, b-s, c-p, d-t, e-q
3. a-r, b-s, c-t, d-q, e-p
4. a-s, b-r, c-p, d-t, e-q

Q.

While seeing objects very close to the eye the ciliary muscles _________.

1. remains same
2. reflects all light

3. expand

4. contract

Q. We all have observed that some people have black eyes, some brown and some light blue. Which part of the eye gives the colour?

1. Crystalline lens
2. Iris
3. Cones
4. Cornea

Q. The size of the pupil of the eye is adjusted by:
(a) cornea
(b) ciliary muscles
(c) optic nerve
(d) iris