Joan's pupil appears to get larger and then smaller as she moves from room to room. This change in size is caused by changes in the __________ and is due to changes in __________.
A) fovea; size of her visual field
B) rods and cones; changing visual stimuli
C) pupillary opening; changes from monocular to dichromatic light
D) iris; amount of incoming light

Question

Quizplus · Accepted Answer

The change in Joan's pupil size is due to changes in the iris, which regulates the amount of incoming light. As she moves from room to room, the light levels may change, causing her pupil to dilate or constrict in response.

Joan's Pupil Appears to Get Larger and Then Smaller as She