Questions for 26 July Zoology

Q:-1 Describe the evolution of Tetrapods. Give the classification of Amphibian with suitable examples. (20)

Q:-2 Compare the paedomorphosis and neoteny. How neoteny played an role in human evolution. (15)

Q:-3 Discuss the various strategies of parental care in amphibians. Explain its significance briefly. (20)

Q:-4 What is split gene ? Discuss the origin of introns. Comment on 2R hypothesis. (15)

Q:-5 What is imprinting? Describe how Igf2's imprinting operate in human. Discuss the role of small RNA molecules in regulating gene expressions. (20)

Q:-6 Briefly explain Wobble hypothesis with examples. Enlist general features of genetic code with examples. (10)

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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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