Practice_Xmas_06 - 1 Zachary was born with a rare visual...

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1. Zachary was born with a rare visual defect. He has no cone photoreceptors in his retina, there are only rods. Assuming that all other aspects of his visual system are normal, which of the following would characterize Zachary’s vision? A) poor visual acuity B) an inability to differentiate between black and white. C) a difficulty seeing in low light conditions. D) colour blindness E) both A) and D) 2. Critics of the trichromatic theory of colour vision have indicated that this theory has a major limitation. Which of the following statements MOST accurately reflects this limitation? A) Young and von Helmholtz were incorrect in assuming that cone photoreceptors in our retina are maximally responsive to a specific wavelength of light. B) The trichromatic theory cannot explain the phenomenon of visual after-effects . C) Rod photoreceptors in our retina, not cones, are responsible for the neural coding of colour. D) Research has determined that there are actually six types of cones in the retina, rather than three as proposed by Young and Helmholtz. E) Trichromatic theory cannot explain sensory adaptation. 3. Sam is preparing her boyfriend’s favorite chili, and as specified in the recipe she has used 18 grams of salt. When her boyfriend tastes the chili, he tells Sam that she needs to add more salt. According to “Weber’s Law” what is the minimum amount of salt that Sam needs to add for her boyfriend to notice that she has added more salt? (Note: The last time that Sam made the chili, her boyfriend was able to just notice a difference in the saltiness of the chili when she increased the salt in the recipe from 9 grams to 12 grams).
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4. Cindy has decided to consult with her optometrist because although she has no problems clearly seeing objects at a distance, she notices that when she tries to read, the print seems blurry and out of focus. After a vision test, her optometrist tells her that the lens in her eye is weak and is focusing the image behind her retina rather than on her retina. Considering these findings, Cindy would most likely be considered to have: 5. Dark adaptation A) takes longer for rods B) produces greater sensitivity in the cones than in the rods C) takes longer when moving from an environment of red light to darkness D) is the process by which photoreceptors are depleted of pigment molecules E) only takes 10 minutes for both rods and cones
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