Questions for 13 August zoology

Q:-1 How sericulture is done? Enlist the whole process, give the chemical nature of silk. (20)

Q:-2 Define haptens. What is immunogenicity? How foreign molecule presented to antibody? (15)

Q:-3 Define immunoglobulins. Give its structure and describe its types. (15)

Q:-4 What is vermicomposting? Which species are more suitable for it? Describe the whole process of vermiculture. (20)

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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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