Water enters the water vascular system through:
Correct answer: D. Madreporite
- A. Radial canal
- B. Ampulla
- C. Ostla
- D. Madreporite
Explanation
The madreporite is a sieve-like, porous plate found on the aboral surface (the side opposite the mouth) of echinoderms such as starfish.It acts as the entry point for water into the water vascular system.Water enters through the madreporite and then circulates through a series of canals (stone canal → ring canal → radial canals → tube feet).
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