Water vascular system is present in coelom in which phylum:
Correct answer: A. Echinodermata
- A. Echinodermata
- B. Annelida
- C. Arthropoda
- D. Cnidaria
Explanation
The water vascular system is a hydraulic system unique to the phylum Echinodermata. It facilitates movement, feeding, and respiration in echinoderms, such as starfish and sea urchins. The other phyla listed-Annelida, Arthropoda, and Cnidaria-do not have this system. Annelida have a closed circulatory system, Arthropoda have an open circulatory system, and Cnidaria have a simple body structure without a vascular system.
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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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