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How do aquatic bladderworts capture their microscopic prey?

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Correct answer: By generating a rapid vacuum suction

Bladderworts are among the fastest-acting predators in the plant kingdom. They pump water out of their tiny bladders to create a vacuum. When a tiny organism touches the trigger hairs, the trap door swings open and sucks the prey inside in less than a millisecond! Photo: Johann Georg Sturm (Painter: Jacob Sturm), Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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