Class 8 Science Chapter-11 The Human Eye DAV|CBSE Book 2021
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Class 8 Science Chapter-11 : The Human Eye
This Post Contains All The Exercises of Chapter 11 Science Of Class 8.
- A.Fill In The Blanks
- B. State True or False for the following statements
- C.Tick(√) The Correct Option
- D.Answer The Following Questions in Brief
- E.Answer The Following Questions
- Value Based Question
- Something To Do
SOMETHING TO KNOW
A. Fill in the blanks :
1. The iris of the human eye determines the colour of a person's eye.
2. The light sensitive screen of the human eye is called retina.
3. The cone-shaped cells, on the retina, respond to the bright light.
4. The defect of vision, in which eyeball becomes smaller than its normal size, is called hypermetropia.
5. A convex lens is used to correct myopia and a concave lens is used to correct hypermetropia.
B. State True or False for the following statements.
1. Iris is the muscular assembly that controls the size of the pupil.
Ans) True
2. The eye lens forms a virtual, erect and diminished image of an object, on the retina.
Ans) False
3. The retina of the human eye has a large number of cone-shaped and rod-shaped cells. The rods can respond even in dim light.
Ans) True
4. Cinematography makes use of the 'persistence of vision of the human eye.
Ans) True
5. For a normal human eye, the range of vision is from (nearly) 25 cm to infinity.
Ans) True
6. Myopia is caused due to excessive curvature of the cornea.
Ans) True
C. Tick (✓) the correct option :
1. The change in focal length of an eye lens, to focus the image of the objects at varying distances, is done by the action of - Ans) Ciliary muscles
2. The impression of the image formed on the retina of the human eye remains forabout -
Ans) 1/16th second
3. The human eye can focus objects at different distances by adjusting the length of the eye lens. This ability of the eye is known as -
Ans) Power of accommodation
4. A near sighted person will face difficulty while reading -
Ans) A street signboard across the street
5. The defect of the human eye, in which the eye lens of a person gets progressively cloudy, resulting in blurred vision, is called -
Ans) Cataract
6. The Braille system, for visually challenged persons, is a -
Ans) Visual aid
B. State True or False for the following statements.
1. Iris is the muscular assembly that controls the size of the pupil.
Ans) True
2. The eye lens forms a virtual, erect and diminished image of an object, on the retina.
Ans) False
3. The retina of the human eye has a large number of cone-shaped and rod-shaped cells. The rods can respond even in dim light.
Ans) True
4. Cinematography makes use of the 'persistence of vision of the human eye.
Ans) True
5. For a normal human eye, the range of vision is from (nearly) 25 cm to infinity.
Ans) True
6. Myopia is caused due to excessive curvature of the cornea.
Ans) True
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