The locomotory organs of echinodermata are:

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Tube feet

Muscular feet

Jointed legs

Parapodia

answer is A.

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Detailed Solution

Concept: Except for species belonging to the phylum Crinoidea, all types of echinoderms have suckers on their locomotor organs. The presence of a water vascular system is what allows for locomotion.
Echinoderms are radially symmetrical aquatic creatures. They have a thick body wall and a mesodermal-derived endoskeleton. Echinoderms are well known for having a water vascular system that aids in movement, food gathering, and prey capture. Tube feet, locomotory organs, are present in them.
Hence, option 1 is the correct answer.

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