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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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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