Question:
Water vascular system present in....A... and water canal system present in....B....
(1) Sponges and Echinoderms
(2) Echinoderms and Sponges
(3) Sponges and Cnidarians
(4) Cnidarians and Ctenophores
Answer: option (2) Echinoderms and Sponges
Explanation:
Solution: The water vascular system is a hydraulic system used by Echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation and respiration. The system is composed of canals connecting numerous tube feet. They move by alternately contracting muscles that force water into the tube feet, causing them to extend and push against the ground, then relaxing to allow the feet to retract.
Phylum Porifera members also known as sponged have a water transport or canal system. Water enters through the minute pores of sponges called ostia in the body wall into a central cavity called spongocoel, from where it goes out through the osculum.
Hence, the correct answer is option (2) That is A (Echinoderms) and B (Sponges).
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