Nightingale Microbiology Practice Exam

Which zone is present only in oceans?

Intertidal zone Neritic zone Abyssal zone Bathyal zone

Correct Answer:

Abyssal zone

Explanation:

Understanding depth-based marine zones helps explain why the deepest ocean floor region belongs to oceans. The abyssal zone is the deep-ocean realm, typically from about 4,000 to 6,000 meters below the surface, where it is pitch dark, extremely cold, and under immense pressure. This region is defined by its position in ocean basins and does not occur in freshwater or inland waters, which is why it is present only in oceans. Other zones—such as the nearshore and shallow-water zones along the continental shelf or the mid-slope bathyal zone—exist in oceans as well, but the abyssal zone uniquely represents the deepest oceanic environment, making it the correct choice.

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