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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.
Characteristics of Metazoa The unicellular protozoans are highly versatile and successful organisms that show remarkable organization and division of labour within the confine
Q. Symptoms of gastro oesophageal reflux disease? Most commonly, people with GERD complain of heartburn, a painful or uncomfortable feeling in the chest, which may radiate to t
Relate the oxide layer and biocompatibility of titanium. The compatibility of a metal with its host environment depends on its resistance to biodegradation and on the degree of
Why should you not apply cosmetics while doing a lab experiment in class?
Unconventional Feed Resources and Anti-Nutritional Factors With increasing ruminant population, there is a need to identify and introduce new and lesser-known food and feed cro
1. Fats promote absorption of fat soluble vitamins like vitamin A, D, E and K. Patients of cystic fibrosis often absorb fat poorly and are at-risk for fat-soluble vitamin deficienc
DIFFERENCE S BETWEEN MAN & RABBIT - S.NO . 1. M A N Brain round RABBIT Elongated 2. Olfa
(a) Explain the structure of a human sperm. (b) Give a schematic representation showing the events of Spermatogeninesis in human male.
What are cilia and flagella? Cilia and flagella are structures found in prokaryotes as well in eukaryotic cells. They play defense, nutrition and movement roles for the cell. I
Q. Write the definition of counselling? Definition of counselling "A process of helping or enabling a person / persons to solve certain interpersonal, emotional problems and
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