Books For DEVELOPMENTAL BIOLOGY

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  1. Rudrakshi11 July 2018 at 05:28

    sir/madam, i am not able to download this. plz help.

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  2. zoolove11 July 2018 at 05:31

    Thanks for letting me to know about the issue. I have fixed it now you can download.

    ReplyDelete

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Questions for 28 July zoology

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Environment & Ecology JULY Week-1

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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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