Sense Organs Quiz
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5 questions, one answer each
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1. What is a sense organ?
- A. A single receptor cell
- B. A group of receptor cells responding to a specific stimulus
- C. A type of muscle
- D. A part of the nervous system that only carries impulses
2. Which part of the eye focuses light onto the retina?
- A. Cornea
- B. Iris
- C. Lens
- D. Optic nerve
3. What happens to the pupil in bright light?
- A. It dilates due to radial muscle contraction
- B. It constricts due to circular muscle contraction
- C. It stays the same size
- D. It closes completely
4. When focusing on a near object, what happens to the ciliary muscles and the lens?
- A. Ciliary muscles relax; lens becomes thinner
- B. Ciliary muscles contract; lens becomes fatter
- C. Ciliary muscles contract; lens becomes thinner
- D. Ciliary muscles relax; lens becomes fatter
5. A patient can see well in daylight but struggles to see in dim light, though their colour vision is unaffected. Which receptor type is most likely impaired?
- A. Cones, because they detect colour
- B. Rods, because they are responsible for vision in dim light
- C. The optic nerve, because it carries all visual impulses
- D. The cornea, because it refracts light