Which phylum is characterized by the presence of a water vascular system?

Assertion : Ambulacral system plays a major role in locomotion of echinoderm.
Reason : Hydraulic pressure of fluid and contraction of muscle of tube feet make possible movement of echinoderm.

Which organism exhibits a body divided into five arms (pentamerous symmetry)?

In which of the following phyla does the adult show radial symmetry,while the larva shows bilateral symmetry?

The water vascular system is a characteristic feature of which of the following phyla?

Tube feet are the characteristic structures of