Cones are used for daylight; Rods for night.

Cones are used for daylight; Rods for night.

• A. Cones are active only at night.
• B. Rods are used for daylight vision.
• C. Cones are used for daylight; Rods for night.
• D. Cones and rods are not related to daylight.

Answer: (C)

In daylight, vision relies on cones because they need brighter light, provide color information, and give high-acuity detail. Cones are densely packed in the fovea, so looking directly at an object in bright light yields sharp, colorful vision. In dim or night conditions, rods take over because they are much more sensitive to light, enabling us to see in low illumination, though they don’t detect color and offer lower spatial detail. So the statement that cones are used for daylight and rods for night correctly describes how these two photoreceptors support different lighting conditions.

In daylight, vision relies on cones because they need brighter light, provide color information, and give high-acuity detail. Cones are densely packed in the fovea, so looking directly at an object in bright light yields sharp, colorful vision. In dim or night conditions, rods take over because they are much more sensitive to light, enabling us to see in low illumination, though they don’t detect color and offer lower spatial detail. So the statement that cones are used for daylight and rods for night correctly describes how these two photoreceptors support different lighting conditions.