| 10 minutes maximum! (can you do it in 5?) |
| 1. The eye is a sense organ. Sense organs have receptors that detect changes in the environment.
Which word describes one of these changes in the environment that is detected?
- A. An effector
- B. A neuron
- C. An affector
- D. A stimulus
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2-6: The image shows a cross section of a mammalian eye:
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2. Structure X is the ...
- A. iris
- B. lens
- C. retina
- D. optic nerve
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3. Structure Y is the ...
- A. sclera
- B. suspensory ligaments
- C. retina
- D. ciliary Muscles
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4. Which structure first refracts the light as it enters the eye?
- A. Cornea
- B. Lens
- C. Conjunctiva
- D. Pupil
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5. Where in the eye are the light receptors found?
- A. structure K
- B. structure L
- C. structure M
- D. structure N
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6. If structure M is damaged ...
- A. light rays do not reach the retina
- B. light rays do not stimulate receptor cells
- C. nervous impulses from light receptors may not reach the brain
- D. we cannot hear sounds
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7+8: The image shows a person's pupil in a dark room. The person leaves the room and goes outside where the sun is shining brightly. |
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7. Which row in the following table shows their pupil size correctly in the two different locations?
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Dark Room |
In Sunshine |
| A. |
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| B. |
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| C. |
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| D. |
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8. This reflex response ...
- A. protects the receptor cells in the retina from damage
- B. ensures that the receptor cells receive enough light energy
- C. is controlled by hormones
- D. is controlled by impulses from the brain
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9. Which of the following is the correct combination for viewing a distant object?
- A. Ciliary muscles contract, suspensory ligaments pulled tight, lens flattens
- B. Ciliary muscles contract, suspensory ligaments loosen, lens bulges
- C. Ciliary muscles relax, suspensory ligaments pulled tight, lens bulges
- D. Ciliary muscles relax, suspensory ligaments pulled tight, lens flattens
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10. The retina has two types of receptor cells, rods and cones.
Which statement is true?
- A. Rods are sensitive to the wavelength of light
- B. Cones are sensitive to both the intensity and the wavelength of light
- C. Rods are sensitive to the intensity of light
- D. Cones are sensitive to the intensity of light
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