Question for 27th august zoology

Q:-1 Define teratogenesis and explain its cause and implication. (20)

Q:-2 discuss the phylogenetic status of Sphenodon and crocodiles. (15)

Q:-3 describe the process of in vitro fertilization. What is the significance of it? (10)

Q:-4 What are the various procedures of cloning?Briefly explain its significance. (15)

Q:-5 discuss the phylogenetic the status of Monotremes. Explain the dentition in mammals. (15)

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CANAL SYSTEM IN Porifera

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Canal system in Porifera (sponges) Body of all sponges is the perforated by large number of apertures through which water enters Inside body and flows through a system of criss-crossing canals collectively forming the canal system which is a characteristic feature of poriferans. Following types of canal systems are found in sponges: Ascon type, with flagellated spongocoel Sycon type, with flagellated radial canals Leucon type, with flagellated chambers Rhagon type, with conical shape and broad base ASCON TYPE This is the simplest type of canal system and is found in  Leucosolenia  and other homocoela. Ostia are present on the surface of body and lead directly into the spongocoel, which is lined by flagellated choanocyte cells. Spongocoel opens to the outside through a narrow circular opening, the  osculum  located at the distal free end of the sponge body. Water enters through ostia into spongocoel and goes out of body through the  osculum . SYCO...
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