Which statement about cone cells is TRUE?

Question

BlackTom AI · Accepted Answer

Cone cells require good lighting to function properly, because they mediate color vision and high visual acuity but have a higher light threshold than rods.

1. Relevant knowledge points and concepts
- Two main retinal photoreceptors: rods and cones. Rods are highly sensitive to light (operate in scotopic/dim conditions) and detect motion and contrast but not color. Cones operate in photopic (well-lit) conditions, support color vision and fine spatial resolution, and come in three types with different photopigments (short/blue, medium/green, long/red wavelength sensitivity).
- Photopigment sensitivity and receptor distribution determine functional roles: cones require more photons to activate and so are ineffective in low light.

2. Step-by-step reasoning
- Identify function: cones are responsible for color discrimination and high acuity. Evidence: trichromacy in humans (three cone types).
- Compare sensitivity: rods have higher gain and respond to single photons in some conditions; cones need many more photons, so in dim light cones are largely inactive and rods dominate vision.
- Therefore, because cones need higher photon flux, they require good lighting to work properly.

3. Calculations/intermediate steps
- No numerical calculation is required here. Conceptually: threshold photon count per cone >> threshold per rod, so in low luminance cone response ≈ zero while rod response > threshold.

4. Why the correct answer is correct
- "They require good lighting to function properly" matches the physiological fact that cones mediate photopic vision and have higher activation thresholds, so they operate in bright light.

5. Why other options are incorrect
- "They contain only one type of photopigment": false — humans have three cone photopigments (S, M, L).
- "They are sensitive to low light and motion": false — that describes rods, not cones.
- "They do not detect color": false — cones are the primary color detectors.

6. Conclusion
The correct choice is "They require good lighting to function properly," which matches the provided answer.

Which statement about cone cells is TRUE?单项选择题

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