Question at position 23 Which of the following statements is true of the cones of the eye's retina?They give us the ability to detect fainter spots of light on the peripheral retina than at the fovea.They require a smaller amount of light to respond than the rods do.They convert electrochemical impulses into light.They are used for color perception.

Question

BlackTom AI · Accepted Answer

Diving into the question about the cones of the retina, we’ll evaluate each statement one by one.
Option 1: 'They give us the ability to detect fainter spots of light on the peripheral retina than at the fovea.' This is inaccurate because cones are densest in the fovea and specialize for high-acuity, color vision in well-lit conditions; peripheral vision at lower light levels relies more on rods and is not the domain of cones. 
Option 2: 'They require a smaller amount of light to respond than the rods do.' This is misleading. Cones actually require more light to function effectively, whereas rods are more sensitive and respond to dim light; this is why color and detailed vision (cones) occur in bright light, not dim light. 
Option 3: 'They convert electrochemical impulses into light.' This describes phototransduction in the opposite direction. Photoreceptors (rods and cones) convert light into electrical signals, not the other way around; the statement reverses the actual process. 
Option 4: 'They are used for color perception.' This aligns with the well-established role of cones: color discrimination and high-resolution vision under adequate illumination. Cones come in different types (typically sensitive to different wavelengths), enabling color perception.
Thus, when considering the function and characteristics of retinal cones, this option best reflects their primary purpose in vision, while the other statements contain factual inaccuracies about sensitivity, peripheral function, or the direction of signal conversion.

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