Ecology And Ecosystems QBA Exam 1 Practice Test

Which abiotic factor directly affects visibility and decreases with ocean depth?

pH Light Temperature Salinity

Correct Answer:

Light

Explanation:

Light penetration determines how far you can see in the ocean. Visibility depends on photons reaching your eyes, and as depth increases, water absorbs and scatters more light, so the light intensity drops rapidly. That reduction in light makes objects harder to distinguish and colors fade, creating a gradual loss of visibility with depth. While pH, temperature, and salinity shape other aspects of the water, they don’t directly set how far light travels, so they don’t directly control visibility in the same way.

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