Why does ocean water glow at night?
Show answer & explanation
Answer: Bioluminescent plankton disturbed
Moonlight reflecting off waves — Wrong. Moonlight creates shimmer but not the blue-green glow. The glowing comes from living organisms (dinoflagellates) producing light chemically.
Bioluminescent plankton disturbed ✓ — Correct! Tiny plankton called dinoflagellates contain luciferin and luciferase. When disturbed by waves, swimming, or boats, they produce a blue-green glow (bioluminescence) as a defense mechanism—possibly to startle predators or attract larger predators to eat their attackers. Millions create glowing waves!
Minerals glowing from sunlight — Wrong. Minerals don't glow at night from stored sunlight. The glow is biological—produced by living plankton through chemical reactions.
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