What zone is known as the mesopelagic zone?

• A. Twilight zone
• B. Bathypelagic zone
• C. Midnight zone
• D. Abyssopelagic zone

Answer: (A)

The mesopelagic zone is the middle depth of the ocean where light starts to fade, earning it the twilight zone nickname because there’s just enough light to see silhouettes but not enough for meaningful photosynthesis. This region sits roughly 200 to 1000 meters below the surface, and organisms here are adapted to low light, often using bioluminescence or performing vertical migrations to the surface at night to feed. The deeper bathypelagic zone has no sunlight and is typically called the midnight zone, while the abyssopelagic zone lies even deeper near the seafloor. Therefore, the mesopelagic zone is best described as the twilight zone.