Ocean trivia

8 ocean trivia questions, from easy to hard. Tap a question to see the answer. They're real questions from Rubicon, where you type the answer yourself and an AI judge reads what you meant.

This set covers Bony Fish & Freshwater Fish, Coral Reefs & Their Life, Crustaceans & Shellfish, Jellyfish, Starfish & Marine Invertebrates, Octopus, Squid & Cephalopods and Sharks & Rays.

Questions and answers

  1. Easy How does a cartilage skeleton help sharks when chasing fast prey?

    Cartilage is more flexible than bone, allowing sharks to make sharp turns and bend quickly.

  2. Easy Why must a growing crab discard its hard outer shell?

    Because the hard shell cannot stretch or grow, the animal must cast it off to expand.

  3. Easy How does more acidic seawater harm young sea snails and corals?

    It removes minerals they need, making it very difficult to build shells.

  4. Medium Why do electric eels generate shocks over six hundred volts to stun prey and deter predators?

    High voltage allows the current to travel through water to remotely immobilize prey muscles and deter large predators.

  5. Medium Which organ triggers the rapid physical decline and death of an octopus after mating?

    The optic gland secretes hormones that initiate rapid biological decline and prevent feeding.

  6. Medium What unusual substance does the roughskin dogfish release into the surrounding water to confuse attacking predators?

    It squirts a glowing, luminous mucus or slime that creates a bright cloud to distract approaching predators.

  7. Hard How do the thousands of microscopic hair-like structures across the feather duster worm's branching crown actively transport captured organic matter into its mouth?

    Coordinated beating cilia generate water currents and propel trapped food particles along grooved pathways down to the mouth.

  8. Hard How do sea stars extend and retract their numerous tiny tube feet to crawl without relying on conventional muscle pairs?

    They pump internal fluid through a specialized hydraulic network to expand or contract individual feet using pressure changes.

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