Questions for 18 July ZOOLOGY

Q:-1 What are the various modes of respiration in Arthropods. Explain the tracheal mode of respiration with suitable diagrams. (20)

Q:-2 What is mutagenesis? Give the name of various chemical mutagens, explain mechanism also. (15)

Q:-3 Discuss various types of chromosomal abbreviations. Explain their significance also. (15)

Q:-4 How mutation play an active role in Cancer? What is nonsense mutations, compare it with sense mutations. (15)

Q:-5 Comment on various types of mouth modification in insects, with suitable diagrams. (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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