A sieve-like plate on the echinoderms surface through which water enters the vascular system and flows to the ring canal through a tube is called
A)madreporite.
B)ampulla.
C)nerve ring.
D)skin gills.
E)endoskeleton.

Question

Quizplus · Accepted Answer

The description matches that of the madreporite, which is the external opening of the water vascular system of echinoderms. The ampulla is a muscular sac that controls the movement of water through the tube feet, the nerve ring is part of the nervous system, the skin gills are respiratory structures in some aquatic animals, and the endoskeleton is the internal supportive structure of echinoderms.

A Sieve-Like Plate on the Echinoderms Surface Through Which Water