Question

this layer of the eye is white and fibrous, as seen on the external surface of th
cornea
iris
choroid
sclera
question 17
the photopigments of the cones do not have peak wavelengths at
blue

Explanation:

First Question (Eye Layer):

The sclera is the white, fibrous outer layer of the eye. The cornea is clear (not white), the iris is colored (controls pupil size), and the choroid is a vascular layer inside, not the external white layer.

Cone photopigments have peak wavelengths in blue, green, and red. So blue is a peak wavelength, meaning cones DO have peak wavelengths at blue. Thus, if the question is "do NOT have", blue is the option that does have a peak, so the answer is the option with "blue" (as the statement is false for blue, so blue is the answer to the "do NOT" question in the sense that it does have a peak, so the "do NOT" is incorrect for blue).

Answer:

D. sclera (assuming options are labeled A: cornea, B: iris, C: choroid, D: sclera; if original labels differ, adjust to match, e.g., the option with "sclera")

Question 17 (Cone Photopigments):

(Note: The question is cut off, but typically cone photopigments have peak wavelengths in blue, green, and red. If the question is "do NOT have peak wavelengths at [option, e.g., maybe yellow? But given the visible option is blue, likely a typo or incomplete. Assuming the intended question is about which is NOT a peak, but blue is a peak. If the options include non - peak like yellow (not shown), but with the given option "blue" is a peak, so if the question is which is NOT, but the shown option is blue, there may be a mistake. However, based on standard knowledge: cone photopigments have peaks in blue (~420 - 440 nm), green (~530 - 550 nm), red (~560 - 580 nm). So if the question is which is NOT a peak, and "blue" is an option, that's incorrect as blue is a peak. But since the question is incomplete, if we assume the question is which is a peak (but the wording is "do NOT have"), there's confusion. If we proceed with standard knowledge, blue is a peak, so if the question is which is NOT, blue would be incorrect (i.e., the answer would be the option that's not a peak, but since only blue is shown, maybe the question was miswritten. If we take the given option "blue" and the question is "do NOT have peak wavelengths at", then the answer would be that blue IS a peak, so the option (blue) is incorrect for "do NOT", meaning the answer is the option with blue (if the question is asking which is NOT, but blue is a peak, so the answer is the option with blue as the one that does have a peak, so the "do NOT" would mean blue is not the answer, but this is confusing due to incomplete question. However, based on the visible part, if we assume the question is "The photopigments of the cones do NOT have peak wavelengths at blue" (which is false, as they do), but as a multiple - choice with "blue" as an option, if the question is which is NOT a peak, and blue is a peak, then the answer is the option with blue (since it does have a peak, so the statement "do NOT have" is wrong for blue, meaning blue is the option that does have a peak, so the answer to "do NOT have" would be blue (as it does have, so the statement is false, so blue is the option that is not correct for "do NOT"). But this is very confusing. Given the incomplete question, we'll state the standard: