Final answer:
Sensory adaptation refers to when sensory receptors become less sensitive over time to unchanging stimuli, and this occurs in both vision and hearing. The correct response to the human eye question is that statement (a) is false because rods detect low light and no colors, while cones detect color.
Step-by-step explanation:
The statement 'Both hearing and vision undergo adaptation' is true. Sensory adaptation is the process by which our sensory receptors become less sensitive to constant or prolonged stimulation. This happens with various senses, including both hearing and vision. For example, when you enter a dark room, at first you might not see much, but after a few minutes, your eyes adapt to the low light and you begin to see more clearly. Similarly, when you are initially exposed to a loud sound, it may seem very loud, but over time your hearing adjusts and it doesn't seem as jarring.
Concerning the question about the human eye, the false statement is (a) 'Rods detect color, while cones detect only shades of gray.' In reality, rods are responsible for vision at low light levels and do not mediate color vision, whereas cones function best in bright light and are capable of detecting colors.