Question for 03 August Zoology

Q:-1 Elucidate the adaptations of animal living in fresh water habitats. (10)

Q:-2 What is IUCN? How code of nomenclature evolved? Explain the role of modern tools and computational analysis in nomenclature. (20)

Q:-3 Define ecosystem. Give its various components. How they are operating. (15)

Q:-4 What is ecosystem services? Why is there a need of legislative verdict on it.? Discuss. (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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