UPSC MAINS 2018 DAF

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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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Anthropology Test Week 2

Week 2 Instructions:- There are Eight questions divided in Two sections. All questions are compulsory. Adhere to world limit wherever specified. The number of marks carried by a question is indicated against it. Paper - I Q:-1 Write notes on the following in about 150 words each: (10X5 = 50) 1) Secondary structure of DNA 2) Rhodesian man 3) Lower palaeolithic Culture 4) Chromosome walking 5) Javanicus Q:-2 Discuss the locomotive behaviour of prehistoric human primates and state how does it help in understanding the structural and functional correlations of their forelimb structure. 20 Q:-3 Comment on mendelian principles and their applications in genetic analysis. (15) Q:-4 Mutation is the hidden force behind evolution, justify the statement with suitable examples and discuss about sources of mutation. (20)                                Paper - II Q:-1 Write notes on the follow...
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Questions for 13 July Zoology

Q:-1 Discuss the characteristic features of phylum Nemathelminthes. Classify the phylum upto Sub classes. (20) Q:-2 Enlist all essential requirements for Translation. How GTP plays regulatory role in process of translation. (10) Q:-3 Compare the process of translation in eukaryotes and prokaryotes. Briefly describe wobble hypothesis. (15) Q:-4 Discuss the life cycle of Wuchereria. Comments on its parasitic adaptations. (20) Q:-5 Discuss the genera features life cycle of Ascaris. Comment on its pathogenic capability and prophylaxis. (20)
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Parasitic adaptation of Taenia

Taenia Parasitic adaptations Tapeworms live as internal parasites and they have to make several adjustments for the same. The following are few of the adaptations made by these tapeworms to make their life easy in their hosts. Presence of enzymatic resistant covering A hard covering called as tegument covers the body of these tape worms. Tegument is enzyme resistant and it protects all the internal organs from the digestive actions of the alkaline fluids of the host. On the other hand tegument is permeable to water and other nutrients. Absence of locomotory organelles This parasite lacks organs for locomotion. As there is no need for any locomotory organs both the adult and larval forms lack cilia or flagella. Osmotic pressure The osmotic pressure inside the body is higher than that of the surrounding host tissue or fluid. This helps the parasite to reside conveniently in the host body. Presence of hooks and suckers for attachment For the attachment purpose a scolex...
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