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The Human Eye (Grade 8)

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The Human Eye

Use the diagram to answer the questions.
Eye Diagram
1. 
Which structure is represented by the letter "A" on the eye diagram above?
  1. retina
  2. pupil
  3. lens
  4. iris
2. 
Which structure is represented by the letter "B" on the eye diagram above?
  1. lens
  2. retina
  3. cornea
  4. optic nerve
3. 
Which structure is represented by the letter "C" on the eye diagram above?
  1. iris
  2. lens
  3. sclera
  4. pupil
4. 
Which structure is represented by the letter "D" on the eye diagram above?
  1. lens
  2. pupil
  3. optic nerve
  4. vitreous humor
5. 
Which structure is represented by the letter "E" on the eye diagram above?
  1. retina
  2. iris
  3. lens
  4. sclera
6. 
Which structure is represented by the letter "F" on the eye diagram above?
  1. vitreous humor
  2. optic nerve
  3. retina
  4. pupil
7. 
Which structure is represented by the letter "G" on the eye diagram above?
  1. vitreous humor
  2. optic nerve
  3. cornea
  4. sclera
8. 
Specialized photoreceptor cells, known as rod and cone cells, are located in which part of the eye?
  1. A
  2. D
  3. F
  4. G
9. 
Which letter represents the clear part of the eye that covers the iris and pupil?
  1. B
  2. C
  3. D
  4. F
10. 
Which letter represents the muscle that controls the size of the pupil and therefore the amount of light entering the eye?
  1. A
  2. C
  3. D
  4. G
11. 
Fill in the blanks below with the letter A - G (or write the name) that represents the part of the eye which correctly completes the paragraph. Each letter will be used once.

A transparent covering called the                         , focuses light as it enters the eye. As light enters, it passes through a small opening known as the                         . The                     , moved by                                     , opens and closes this hole to regulate the amount of light entering the eye. The                       refracts and focuses light onto the back of the eye, where the                         , with its rods and cones, is located. Information gathered by the eye transmits to the brain via the                                   .

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