Viewing the Objects

Q.

Pupil is the aperture surrounded by the ciliary body.

1. True
2. False

Q.

Fill in the blanks with correct words.

_______ is the capacity of the eye to focus at different distances.

Q. Why are our eyes more sensitive to yellow light than red light?

Q.

What is the adjustment of the eye in order to obtain a clear vision of objects at different distances called?

Q. Q. Given below is an example of a certain structure and its special functional activity. On a similar pattern fill in the blanks with suitable functions:

Example : Chloroplast and Photosynthesis:

(i) Ciliary Body and ________________

Q.

When light enters the human eye, it first reaches ___ , then ___ and finally it reaches the ___ .

1. cornea, crystalline lens, retina

2. crystalline lens, cornea, retina

3. retina, crystalline lens, cornea

4. retina, pupil, iris

Q.

Which of the following is/are responsible for refraction and focusing?

1. Sclera

2. Ciliary muscles

3. Lens

4. Retina

Q. The image on a retina is transferred to the brain through an optic nerve.

1. True
2. False

Q.

____ controls the size of the pupils.

Q.

While viewing nearby objects, the curvature of the lens:

1. Decreases

2. Increases

3. Remains the same

4. Its unpredictable

Q.

Answer the following questions.

An aperture through which light rays enter the eye.

Q.

Which of the following is/are responsible for refraction and focusing?

1. Sclera

2. Ciliary muscles

3. Lens

4. Retina

Q.

Where is the image formed inside the eye of a person with normal vision?

1. on the retina

2. in front of the retina

3. behind the retina

4. on the iris

Q.

The ability of the eye to form an image on the retina by adjusting the focal length of the eye lens based on the position of the object is called _____.

1. power of lens

2. power of accommodation

3. power of retina

4. presbyopia

Q.

The part of the eye which helps in its accommodation is:

1. Retina

2. Ciliary muscles

3. Iris

4. Cornea

Q. Arrange the following in the order in which a light ray travels to enable vision in the human eye.

1. External light
2. Cornea
3. Pupil
4. Eye lens
5. Retina