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  4. Ambulacral grooves are absent in the living forms of the Class

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Q. Ambulacral grooves are absent in the living forms of the Class

AIIMSAIIMS 2002Animal Kingdom

Solution:

Ambulacral grooves are found in the arms of echinoderms lined by tube feet. Ambulacral grooves are absent in Ophiuroidea which are covered by ossicles.