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Which one assists in locomotion?

1. Trichocysts in Paramecium
2. Pedicellariae of Star Fish
3. Clitellum in Pheretima
4. Posterior sucker in Hirudinaria

Correct answer: Posterior sucker in Hirudinaria

Solution

The posterior sucker of Hirudinaria (leech) helps it anchor to a surface during movement, enabling inchworm-like locomotion. The other options serve defense, reproduction, or prey handling rather than movement.

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