Textbook Question
Accessory glands that produce an oily secretion are the
a. Conjunctiva
b. Lacrimal glands
c. Tarsal glands
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15. The Special Senses
Rods, Cones, and Light
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Imagine that you are walking in the woods at night in very low light. A red flower and a green leaf are both reflecting the same total amount of light. Which would appear brighter to you and why? The image is provided for reference.
A
The red flower. The cones will be most important in low light, and red wavelengths excite multiple cone cells.
B
The red flower. The rods will be most important in low light, and rods are most excited in the red spectrum.
C
The green leaf. The rods will be most important in low light, and rods are most excited in the green spectrum.
D
The green leaf. The cones will be most important in low light, and green wavelengths excite multiple cone cells.
Verified step by step guidance1
Begin by understanding the role of rods and cones in the human eye. Rods are responsible for vision in low light conditions, while cones are responsible for color vision and function best in bright light.
Examine the graph provided. It shows the relative absorbance of different photoreceptor cells (S Cone, M Cone, L Cone, and Rods) across various wavelengths of light.
Notice that rods have a peak absorbance around the green spectrum, approximately 500 nm. This indicates that rods are more sensitive to green light compared to red light in low light conditions.
Understand that in low light conditions, such as walking in the woods at night, rods are the primary photoreceptors used for vision. Since rods are more excited by green wavelengths, the green leaf would appear brighter than the red flower.
Conclude that the correct answer is: The green leaf. The rods will be most important in low light, and rods are most excited in the green spectrum.
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