Questions for 30 july zoology

Q:-1 Discuss the origin of mammals and briefly explain adaptations of aquatic mammals. (20)

Q:-2 Give the anatomical features of pituitary gland. Describe its secretions regulating other endocrine glands with feedback mechanism. (15)

Q:-3 Compare the features monotremata and marsupials. How they are different from primates. (15)

Q:-4 What is speciation? How natural selection operates? (10)

Q:-5 Define isolation. Give various isolation mechanism and describe how they are contributing to speciation? (20)

Q:-6 Compare the Batesian and Mullerian mimicry. Discuss evolutionary significance of mimicry. (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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