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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.
Cleavage - Metazoa The unicellular zygote begins cell division (cleavage). First, the single cell divides forming two cells, these redivide further to form four, then eight ce
What is (a) the male gamete, and (b) the female gamete in a flowering plant? (a) The male gamete in a flowering plant is the pollen grain (strictly, the gamete is the male
What are the Pupillary defects There are certain deviations from normal pupillary reflexes which point towards certain specific pathology.
Combination of diuretics may be indicated in patients previously resistant to furosemide alone. Profound diuresis and clinical improvement may occur after the addition of metolazon
Population You must be familiar with the term 'population'. It is one of the most talked about issues of this century. It is feared that the rapid growth of the world population
What is a pigment? Scientifically, a chemical that can impart colour and is insoluble in the solvent in which it is used, is referred to as a 'pigment'. Well, you would agree
Niacin affects all lipid parameters favorably. It is one of the only agents that reduces Lp (a) significantly (up to 30 per cent). Unfortunately, compliance is poor because of freq
What do you understand by the terms retrogradation and gelatinization? The realignment of the amylose and amylopectin and swollen starch granules to form a pocket is termed
Motion Sickness The pathogenesis of motion sickness is poorly under- stood. The prescription cholinergic blocker scopolamine in a patch or oral formulation can decrease sympto
The Environmental Disasters Are Classified Into Two Major Categories: 1. Natural Disasters like Earthquakes, Tsunami, Landslides, Cyclones, Floods, and Droughts Etc. 2.
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