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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.
What are the major terrestrial biomes? The main terrestrial biomes are: tundra, taigas (or boreal forest), temperate forests, tropical forests, grasslands and deserts.
Explain the Root-End Preparation - endodontic surgery a. Class I type preparation, 3mm depth. b. Tips are designed in a length of 3 mm to prevent procedural errors. c. Ul
Define Goals of National and International Requirement Estimates and RDAs? One of the goals of the RDAs has been reiterated through this unit. They serve as the guidelines for
Explain Precautions for Preparation of Bacterial Smear? 1. Plates used should be prepared 24 hours before use to avoid spreading of colonies due to moisture in plates. 2. Sw
Neuron A is a healthy neuron with all the usual ion channels. When at rest with a membrane voltage of R millivolts, neuron A produces no action potentials. The voltage thres
How is retaining wall works? A retaining wall together with the backfill the wall retains and the soil that supports the wall is a highly indeterminate system. The magnitudes o
Q. Complications during angina pectoris? It is a symptom giving a warning of impending myocardial infarction, sudden cardiac death or even ischemic necrosis of the brain leadin
Explain the Disadvantages of tissue punch - There is a loss of keratini-ed tissue and this can lead to a compromised soft tissue barrier in cases where there is deficiency of a
What is Atrial Switches Operations (Senning or Mustard Operation) ? In transposition of the great arteries there is ventriculo arterial discordance whereby aorta arises from ri
What are the Results of Chronic Pulmonary Thromboembolism? Results : The reported mortality is between 5 and 24 per cent. On follow-up, the six-year survival in the best ce
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