The Human Eye (Grade 8)
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The Human Eye
Use the diagram to answer the questions.
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1.
Which structure is represented by the letter A on the eye diagram?

- retina
- pupil
- lens
- iris
2.
Which structure is represented by the letter B on the eye diagram?

- lens
- retina
- cornea
- optic nerve
3.
Which structure is represented by the letter C on the eye diagram?

- iris
- lens
- sclera
- pupil
4.
Which structure is represented by the letter D on the eye diagram?

- lens
- pupil
- optic nerve
- vitreous humor
5.
Which structure is represented by the letter E on the eye diagram?

- retina
- iris
- lens
- sclera
6.
Which structure is represented by the letter F on the eye diagram?

- vitreous humor
- optic nerve
- retina
- pupil
7.
Which structure is represented by the letter G on the eye diagram?

- vitreous humor
- optic nerve
- cornea
- sclera
8.
Specialized photoreceptor cells, known as rods and cones, are located in which part of the eye?

- A
- D
- F
- G
9.
Which letter represents the clear part of the eye that covers the iris and pupil?

- B
- C
- D
- F
10.
Which letter represents the muscle that controls the size of the pupil and therefore the amount of light entering the eye?

- A
- C
- D
- 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 .
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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