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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 4

Week-4 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) a) Monotheism and Religion b) Neo-evolutionism c) Language d) Structural functionalism e) Totemism Q:-2 Give the various anthropological theories. Whic theory is most relevant in term of defining society and why? (20) ing Q:-3 Discuss the concept of people's participation in planned development. (10) Q:-4 (a) In what ways economics and economic anthropology differs. (10) (b) Bring out the contribution of Tyler and Conklin in development of cognitive theory. (15) (c) Give the various tools of data collection and interpretation. Why is data analysis important in anthropology? (20) ...
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Question for 27th august zoology

Q:-1 Define teratogenesis and explain its cause and implication. (20) Q:-2 discuss the phylogenetic status of Sphenodon and crocodiles. (15) Q:-3 describe the process of in vitro fertilization. What is the significance of it? (10) Q:-4 What are the various procedures of cloning?Briefly explain its significance. (15) Q:-5 discuss the phylogenetic the status of Monotremes. Explain the dentition in mammals. (15)
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Questions for 23 August Zoology

Q:-1 Describe blastogenesis. Discuss the role of morphogens to establish the body axis in Drosophila . (20) Q:-2 Compare the life cycle of Obelia and Aurelia . Describe alteration of generation in them. Q:-3 Discuss the parasitic adaptations of F.hepatica and T. Solium . (10)
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Retrogressive Metamorphosis

Retrogressive Metamorphosis in Urochordates Metamorphosis is a change from the juvenile to adult stage in which larval stage is quite different from the adult stage. In retrogressive metamorphosis the larva possesses advanced characters which are lost during the development and the adult is either sedentary or degenerated with primitive characters. Urochordate adults, being sedentary show degenerative characters while the free swimming tadpole larva shows advanced chordate characters which are lost during metamorphosis. Parasitic crustaceans, like Sacculina and copepod parasites and stylopids and scale insects (Insecta) also show retrogressive metamorphosis. Retrogressive Metamorphosis in Herdmania The tadpole larva of Herdmania is only 1-2 mm long when it hatches out of the egg. It does not feed and hence has only 3 hours of survival during which it has to swim about in search of a suitable substratum for attachment. The larva needs advanced features for its free swimming existence,...
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