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Question
Which of the following functions are not performed by the water vascular system in Asterias?
Which of the following functions are not performed by the water vascular system in Asterias?
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Solution
The correct option is D Reproduction
Water vascular system in Asterias serves for locomotion, respiration and food capture. It basically consists of a system of canals and reservoirs containing a watery fluid, the system consisting of a sieve plate, or madreporite, and a ring vessel, or water-vascular ring, that are connected by a frequently calcified vessel called the stone canal. Five radial water canals extend outward from the ring vessel and give rise to branches that end in the tube feet, which are in contact with the sea. It is specifically the tube feet that are used to pass food to the mouth at the centre, and can attach to surfaces.
Reproduction
Water vascular system in Asterias serves for locomotion, respiration and food capture. It basically consists of a system of canals and reservoirs containing a watery fluid, the system consisting of a sieve plate, or madreporite, and a ring vessel, or water-vascular ring, that are connected by a frequently calcified vessel called the stone canal. Five radial water canals extend outward from the ring vessel and give rise to branches that end in the tube feet, which are in contact with the sea. It is specifically the tube feet that are used to pass food to the mouth at the centre, and can attach to surfaces.
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