Arms are absent in

  • A
    Sea urchin
  • B
    Sea cucumber
  • C
    Both $(A)$ and $(B)$
  • D
    None of these

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Tube-feet are the locomotory organs of

Starfish belongs to the class:

Which animal group possesses a water vascular system?

Role of the water vascular system in Echinoderms is :
$A.$ Respiration and Locomotion
$B.$ Excretion and Locomotion
$C.$ Capture and transport of food
$D.$ Digestion and Respiration
$E.$ Digestion and Excretion
Choose the correct answer from the options given below :

Water vascular system (ambulacral system) is typically found in

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