[Campbell Biology P.1143] Based on Figure 49.12 and the accompanying text, what can be conclu... | Practice Question

Based on Figure 49.12 and the accompanying text, what can be concluded about the dolphin's brain activity at Time: 1 hour?

  • A: Both hemispheres are in a state of wakefulness, characterized by high-frequency waves.
  • B: The left hemisphere is asleep, while the right hemisphere is awake.
  • C: Both hemispheres are asleep, characterized by low-frequency waves.
  • D: The right hemisphere is asleep, while the left hemisphere is awake.

Explanation

At Time: 1 hour in Figure 49.12, the left hemisphere shows low-frequency waves, which the key indicates are characteristic of sleep. Simultaneously, the right hemisphere shows high-frequency waves, which are characteristic of wakefulness. This directly supports the text's description of dolphins sleeping with one hemisphere at a time.