Questions for 31 July Zoology

Q:-1 Write short notes on the following in 200 Words each 10X4-40
a) Scales in fishes
b) Jaw suspensorium in vertebrates
c) Endoskelton in fishes and amphibians
d) Respiratory organs in amphibians and reptilians comparative account

Q:-2 Discuss the evolution of heart with suitable diagrams and give detailed account of it in mammals. (20)

Q:-3 What is hardy weinberg law? In a large experimental Drosophila population, the fitness of a recessive phenotype is calculated to be 0.90, and the mutation rate to the recessive allele is 5 × 10−5. If the population is allowed to come to equilibrium, what allelic frequencies can be predicted? (5+10)

Q:-4 Discuss the origin of humans with suitable fossil descriptions. (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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