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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.
Types of Organization Chart: There are two important types of organization chart. a) Vertical i.e., from top to bottom. b) Horizontal i.e., from left to right.
Spermatogonia Spermatogonia are the youngest germ cells from which spermatozoa proliferate. These lie next to the basement membrane and undergo series of mitotic divisions lea
Explain about Diabetes mellitus Diabetes mellitus (DM) has relation with all the systems of our body. With some systems it has direct relationship, while with others it has in
The modern water treatment plan is often called upon to perform wonders with the water fed to it. The clear, safe , even tasteful water that comes from a faucet may have started a
What is the cell division process directly related to the embryonic growth? The embryonic growth depends directly on mitosis. By this type of cell division the zygote separates
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compare the lengths and paths of the uterine tubes (oviducts) of the cat and the human
What is the role of ecology to the evolution theory.
What is the optimum temperature for catalyses? For any chemical reaction, the reaction rate enhances with temperature, so the higher the temperature, the faster the rate. For a
Explain about the Gelation? Gelation refers to the process where denatured molecules aggregate to form an ordered protein network. Proteins can form a well-ordered gel matrix b
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