Which of the following helps in locomotion?

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(D) Locomotion refers to the movement of an organism from one place to another. $A$. Trichocysts in Paramecium are defensive organelles,not involved i

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Posterior sucker in Hirudinaria

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(D) Locomotion refers to the movement of an organism from one place to another. $A$. Trichocysts in Paramecium are defensive organelles,not involved in locomotion. $B$. Pedicellariae in Starfish are small wrench-like structures used for cleaning the body surface and protection,not for locomotion. $C$. Clitellum in Pheretima (earthworm) is a glandular structure involved in cocoon formation,not locomotion. $D$. Hirudinaria (leech) uses its anterior and posterior suckers for attachment and locomotion (looping movement). Therefore,the posterior sucker is involved in its locomotion.

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