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Get Answers to all your Questions
- #National Eligibility Cum Entrance Test
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- #Diversity in Living World
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Water canal system : Sponges :: Water vascular system :_______
Option: 1
Porifera
Option: 2
Echinoderms
Option: 3
Hemichordates
Option: 4
None
Answers (1)
Body Plan and Water Vascular System of Echinoderms:
- Adult Echinoderms are pentaradially symmetrical while larvae are bilaterally symmetrical.
- Their endoskeleton is made up of calcareous ossicles.
- The coelom is modified to form the characteristic ambulacral or water vascular system.
- It consists of a central ring canal and radial canals that stretch along each arm.
- The tube-feet project from the holes. The tube-feet show contraction and expansion.
- The flow of water in water vascular system can be depicted as:
Water enters through madreporite ? stone canal ? ring canal ? radial canals ? ampulla ? tube feet
- It is used in locomotion, capture of prey, transfer of food and respiration.
-
Water vascular system is present in echinoderms.
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