Questions for 09 July Zoology

Q:-1 Describe the characteristics of Phylum Porifera. Classify the phylum upto subclasses.(20)

Q:-2 Compare the Chromatin and heterochromatin. How mammalian heterochromatin different from others lower vertebrates. (15)

Q:-3 Discuss the reproduction in porifera. (10)

Q:-4 What is giant chromosome? Discuss its various types. Comment on giant chromosome present in maize. (20)

Q:-5 Compare the organization of DNA in prokaryotes and eukaryotes. What are the various kinds of movement shown by chromosomes? (20)

Q:-6 Discuss the skeleton of porifera. Briefly explain canal system. (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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