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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.
Q. In 1665 Robert Hooke, an English scientist, published his book Micrographia, in which he explained that pieces of cork viewed under the microscope presented small cavities simil
Charles Darwin was the first person to suggest that: a. the present forms of all existing species are the result of natural selection b. species have changed over long periods of t
Define methods of prevention and control of anaemia? The available methods of prevention and control of anaemia are: Supplementation Food fortification Dietary
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URINIFEROU S TUBULE - Unit of kidney. 3-5 cm. long (30 mm). Total length of nephrons is 65 km. A tubule consists of - 1 . Malpighian capsule (
all about spleen
what is the correct classification of phylum mollasca
chimolithotrophy
Why is holophytic nutrition a mode of autotrophic nutrition
State in brief about the term - Calcium and Magnesium Exchangeable forms of these ions are considered to be available nutrients. The concentration from extractant is found by
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