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Tlie phylum Cnidaria or Coelenterata, includes the faliiiliar hydras, jelly fishes, sea anemones and corals. You have olreacly studied about Cnidarialis in Units 4 and 7 of LSE-09 course. These are often brilliantly colourcd. They exhibit radial symnietry, The Cnidarians possess two basic metazoall structural features. Onc, there is an intenla1 space for digestion, called in Cnidarinns as gastrovascular cavity. This cavity lies along the polar axis of the animal atid opens to tlie outside at one end to for111 noutli, Tlie presence of a mouth a~id digestive cavity permits the use of a mucll greater rnlige of food sizes than is possible in tlie protozoarls and sponges. Two, in Clidariails a circle of tentacles, representing exte~lsiolls of the body wall, surrounds tlie ~lioiltli to aid in tlie capture and ingestion of food. Tlie Cnidarian body wall consists of three basic layers: an outer lnycr of cpidennis, nn inner layer of elidoder~nal cells lining Ilie gastrovnscilar cavity, and between these two a layer called mesoglea. The rnesoglea ranges from n tliin, non cellilar membranc to a thick, fibrous, jelly-like, coid lnaterial with or without wanderillg a~noebocytes, A considerable number of different cell types compose tlie epidermis and gastrader~nis, but there is only a limited degree of organ development.
Animals in the Community - Nature and Structure of Community The animals in the community are directly or indirectly dependent on the plants also time their activities in such
Explain the Biochemical Approach in Taxonomy Comparative biochemistry is being used increasingly in the systematic of animals, both for identification of organisms as well as f
Based on your reading of the article "Hello Mothers, Hello Father" which of the following is a correct statement regarding the transplantation of mitochondria? A. The sperm cel
Assume that you have a stock solution of epinephrine at a concentration of 1mg/ml. Further assume that there are 20 drops/ml. a. Calculate the number of drops of the stock solution
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Q. What are the few examples of the structural function of organic molecules? Ans. Organic molecules have a structural function as they are part of cell membranes, organ w
A lk a l in e indigestion The disease occurs due to the consumption of excessive amount of protein rich concentrate or non protein nitrogenous substance like urea, and is
what is the problem that the theory of evolution and its rival theories try to solve?
Q. What are the kinds of fecundation that occur in arthropods? What is the predominant kind? In arthropods there are species having exterior fecundation and other species havin
Q. What do you mean by Binomial system in binomial nomenclature? In the previous sections we have outlined the concepts of binomial nomenclature at International level and the
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