Question

1. The light-sensitive part of the eye.

2. A dark muscular diaphragm.

3. Disease caused due to the weakening of the ciliary muscles.

4. Part of the eye that causes the refraction of light rays entering the eye.

5. Part of the eye responds to illumination.

6. Cells responding to the intensity of light.

7. Develops when the eye lens of a person becomes cloudy due to the formation of a membrane over it.

8. The black opening between the aqueous humour and lens.

Answer 1

1. The image formation in the eye takes place at the retina

1. It is the screen of the human eye
2. Hence, the light-sensitive part of the eye is called the RETINA

2. The pigmented part of the eye is called the iris.

1. A dark muscular diaphragm is IRIS

3. Presbyopia occurs as a part of ageing.

1. The nearby and far off objects both become blurry.
2. Thus, the weakening of ciliary muscle causes PRESBYOPIA

4. The outermost white part of the eye is called the cornea.

1. It refracts the light entering through it.
2. Thus, the part of the eye that causes the refraction of light rays entering the eye is CORNEA.

5. Part of the eye that responds to illumination is CONES.

1. These are sensitive to colour.

 6. Rod cells are sensitive to the intensity of light.

1. These are present in large quantities at the periphery of the retina.
2. Cells responding to the intensity of light are called RODS.

7. The growth of a membrane over the eye lens is called a cataract.

1. Hence, CATARACT develops when the eye lens of a person becomes cloudy due to the formation of a membrane over it.

8. Thus, the black opening between the aqueous humor and lens is PUPIL.

1. Light enters our eyes through it.