Question

Which of the following organisms has the water vascular system as a distinctive feature?

• A. Echinoderms
• B. Annelids
• C. Chordates
• D. Molluscs

Answer 1

Answer: (A)

Echinoderms

Phylum Echinodermata includes spiny skinned animals. Phylum Echinodermata shows following characters:

1) The body cavity is true enterocoeles coelom. Coelom is divided into tubules and sinuses by ciliated peritoneum to form water vascular, haemal and peri haemal system.

2) Water vascular system is supported by tube feet which not only help in locomotion but support ingestion and respiration.

Thus option A is the correct answer.