Respiration by dermal gills $(branchiae)$ and respiratory tree is performed by the animals of

Which of the following options have features corresponding to the given animals?
$Aplysia$, $Asterias$, $Antedon$, $Echinus$

Write the general characteristics of the phylum Echinodermata.

Which of the following functions is $NOT$ performed by the water vascular system of a starfish $(Asterias)$?

Which structure is used for locomotion in starfish?

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.