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Q What are the major classes into which the phylum is divided? What are the few examples of each and in which form (polyp or medusae) are they found?
Coelenterates are divided into three major classes: hydrozoans, anthozoans and scyphozoans. In hydrozoans the polypoid form predominates and examples are by-the-wind- sailors, hydras and Obelia. In scyphozoans the major phase is the medusoid and the best known instance is the common jellyfish (Aurelia). In anthozoans there is only the polypoid form and sea anemones and corals are notable in this group.
Why is the uricotelic excretion essential for avian and reptile embryos? In reptiles and birds the excretory system is uricotelic as uric acid is insoluble, less toxic and sui
Prostaglandins and the structurally associated molecules prostacyclins, leukotrienes and thromboxanes, are called as eicosanoids because they having 20 carbon atoms. These hormones
(a) What are the immediate effects of exercise on the functions of (i) the heart, (ii) the lungs, (iii) the liver? (b) How do these changes help to meet the needs of exercise
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weberian oscles found in
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What is the root cap? The root cap is a protective structure located in the tip of the growing root. It protects the meristematic tissue of the root forming a cap that surround
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Amino acid is any of a class of 20 molecules which are combined to form the proteins in living things. Consisting of the general formula NH2-CHR-COOH, where "R" is the side chain
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