41. For humans, the ability to _______ is probably the most important sense.

a. hear

b. taste

c. see

d. smell

42. Light enters the eye through the _______.

a. cornea

b. pupil

c. iris

d. retina

43. The inner lining on the back of the eyeball which is sensitive to light is called the _______.

a. fovea

b. retina

c. iris

d. optic nerve

44. Light is focused on the retina by the _______.

a. cornea

b. pupil

c. iris

d. lens

45. The shape of the lens adjusts in order to _______.

a. protect the eye from too much light

b. let in more light when it is dark

c. focus on different objects at different distances

d. allow time for the eye to adjust to bright light

46. Rods and cones are found in the _______.

a. retina

b. iris

c. optic nerve

d. cornea

47. Rods and cones are connected to ________.

a. optic neurons

b. bipolar neurons

c. interneurons

d. efferent neurons

48. Photo receptors which see best at night are the _______.

a. foveas

b. cones

c. shafts

d. rods

49. The eyes detect different colors by using the _______.

a. cortex

b. cones

c. shafts

d. rods

50. The range of electromagnetic wavelengths that we can see is called the:

a. visible spectrum.

b. acuity range.

c. visual field.

d. visual angle.

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