21. The main body of a tapeworm is the chain of proglottids True O False 22. The class of cnidarians with the most conspicuous medusa stage is O a) Hydrozoa 。b) Scyphozoa 。c) Anthozoa Od) Ctenophora O e) All of the above 21. The main body of a tapeworm is the chain of proglottids True O False 22. The class of cnidarians with the most conspicuous medusa stage is O a) Hydrozoa 。b) Scyphozoa 。c) Anthozoa Od) Ctenophora O e) All of the above
21) True. An adult tapeworm has a knoblike head which is equipped with hooks for attaching to the wall of the host, neck region, and a series of flat, rectangular body segments or proglottis which are generated by neck. The chain of proglottis may reach the length of 4.6-6. 1 metre. 22) Cnidarians generally have 2 body forms: polyp and Medusa, both of which often occur within the life cycle of single cnidarian. In Scyphozoans, the form known as Medusa is larger and better known than the form known as polyp form.
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