Which of the following statements about the eye is not true?

Question

BlackTom AI · Accepted Answer

Rods are not color-sensitive; cones provide color vision. Rods detect low light and motion, while cones (three types sensitive to different wavelengths) mediate color and high-acuity daytime vision. This key distinction shows the given statement about both photoreceptors being color sensitive is false.

1. Relevant knowledge points and concepts
- Lens: a transparent, biconvex structure located just behind the iris that focuses incoming light onto the retina by changing shape (accommodation).
- Retina: the light-sensitive neural layer lining the back of the eye that converts light into electrical impulses.
- Photoreceptors: two main classes—rods (scotopic vision, high sensitivity in dim light, no color discrimination) and cones (photopic vision, color discrimination and high spatial acuity).
- Optic nerve: the pathway that carries electrical signals from retinal ganglion cells to the brain, where signals are processed into the images we perceive.

2. Step-by-step reasoning
- Read the four options and test each against anatomical and physiological facts.
- Option about the lens: the lens is indeed the clear structure behind the iris that focuses light; this matches textbook anatomy, so it is true.
- Option about the retina: the retina is light-sensitive and generates electrical impulses transmitted to the brain; this is true.
- Option about rods and cones: rods are not color-sensitive; only cones detect color. Therefore the statement claiming both are color-sensitive is false.
- Option about electrical signals/optic nerve: signals travel from the retina through the optic nerve to the brain for image formation; this is correct.

3. Intermediate steps (no numerical calculation required)
- Contrast rod vs. cone function: rods → high sensitivity, grayscale/night vision; cones → color and detail. This directly contradicts the claim that rods are color-sensitive.

4. Why the correct answer is correct
- The statement "Rods and cones are both color sensitive photoreceptor cells in the retina responsible for color perception." is incorrect because rods lack the wavelength-selective photopigments and neural pathways needed for color discrimination; only cones perform that role.

5. Why the other options are not correct answers (i.e., why they are true)
- Lens option correctly describes the lens’s location and focusing function.
- Retina option correctly describes its light sensitivity and role in sending impulses.
- Optic nerve option correctly describes signal transmission to the brain.

6. Conclusion
The false statement is "Rods and cones are both color sensitive photoreceptor cells in the retina responsible for color perception." This matches the provided answer.

Which of the following statements about the eye is not true? 单项选择题

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