Which statement about rods and cones in the eye is correct?
a. Cones respond to particular wavelengths (colors) of light, while rods perceive light at low intensity without
color perception.
b. Rods respond to particular wavelengths (colors) of light, while cones perceive light at low intensities without
color perception.
c. Cones are more sensitive to single photons of light than rods.
d. Nocturnal animals have a high concentration of cones and relatively few rods.
e. Humans have approximately equal numbers of rods and cones, but the cones are primarily localized in the
fovea.
ANSWER: a
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