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Q. Ambulacral system is mainly useful for :

Uttarkhand PMTUttarkhand PMT 2004

Solution:

Water vascular system is a division of the coelom and most distinctive feature of echinoderms. It is a system of canals and body wall appendages and also term as ambulacral system which functions as a means of locomotion. It consists of sieve plates, stone canal, water ring or ring canal, radial canals and podia or tube feet.