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The ability of the Venus fly trap to capture insects is due to:

1. specialised 'muscle-like' cells
2. chemical stimulation by the prey
3. a passive process requiring no special ability on the part of the plant
4. rapid turgor pressure changes

Correct answer: rapid turgor pressure changes

Solution

The Venus flytrap closes when trigger hairs are stimulated, causing rapid changes in turgor pressure in the trap cells. This sudden pressure shift makes the leaf snap shut quickly enough to catch prey.

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