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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.
Second Stage of Invagination The 2 nd stage of invagination starts with release of secondary mesenchyme from the tip of archenteron into the blastocoel. The cells of secondar
Risk during crown removal -Tooth inadvertently extracted using a crown\bridge remover . -Endodontic therapy was performed , and the tooth was replanted , a procedure known
Q. What is the Biology field that studies the classification of living beings? The Biology field that studies the classification of living beings is termed as Taxonomy. Q.
Q. How can the tubular-dorsal nervous system in chordates be compared to the nervous pattern present in invertebrates? In chordates the nervous system is dorsal and highly ceph
Introduction: There are different technologies available for dealing with waste water management and excreta. Some are suitable for dealing off-site sanitation and other can b
Give three reasons why energy transfer between trophic levels is not 100 percent. Some of the organisms in a trophic level escape being eaten; some energy is kept in molecules
Give the introduction to evaluation of patient clinical examination ? A careful physical examinations is a very important for assessing the cardiovascular system and after prov
Absorption of proteins in infants In infants, permeability of the intestine appears to be greater than in later life, and some large protein molecules such as antibodie
Define Male and Female Ascaris Lumbricoides? Ascaris lumbricoides unlike most free-living nematodes and a large number of parasites of plants and animals are not tiny or micro
Biogeochemical Cycling - Nutrient Cycles The energy flows through ecosystems enabling the organisms to perform various kinds of work, and is ultimately lost as heat. It is gon
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