Question

Perforated surface plate of water vascular system is

• A. Stone canal
• B. Madreporite
• C. Ring canal
• D. Ossicle

Answer 1

The correct option is B Madreporite

A) Stone canal is a calcareous tube that connects the madreporite to the ring canal.

B) The perforated plate which controls the entry of sea water into the vascular system is called madreporite.

C) The ring canal is a circular ring and is situated around the mouth and gives rise to gives to extensions called radial canals.

D) Ossicles are small calcareous elements embedded in the dermis that provide rigidity and protection.

So, the correct answer is 'Madreporite'.