ASVAB (Armed Services Vocational Aptitude Battery)Paragraph Comprehension (PC)Medium
Read the following passage: "The human eye contains two main types of photoreceptor cells: rods and cones. Rods are far more numerous, numbering around 120 million, and are primarily responsible for vision in low-light conditions, detecting shades of gray and motion. Cones, though fewer in number (about 6 million), are concentrated in the fovea, the central part of the retina, and are essential for high-acuity vision and color perception in bright light. Individuals with certain genetic conditions may have deficiencies in specific types of cones, leading to various forms of color blindness. Both rods and cones convert light into electrical signals that are sent to the brain for interpretation." Based on the passage, what is the primary function of cone cells in the human eye?
- AProviding sharp vision and color perception.
- BFiltering out harmful ultraviolet light.
- CEnhancing vision in dim light conditions.
- DDetecting motion in peripheral vision.
Show answer & explanationAnswer & explanation
Correct answer: A. Providing sharp vision and color perception.
The passage states that cones 'are essential for high-acuity vision and color perception in bright light.' This directly describes their primary function.
Why the other options are wrong
- B. The passage does not mention filtering UV light as a function of cones.
- C. Vision in dim light is primarily the role of rods, as mentioned in the passage.
- D. Detecting motion is primarily a function of rods, as stated in the passage.
Cone Cells Function
Photoreceptor cells in the retina responsible for color vision and high spatial acuity in bright light.
- Concentrated in the fovea.
- Detect color.
- Provide sharp, detailed vision.
Memory trick: Cones See Color Clearly; Rods See Dark.