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In earthworms, when the ovaries mature, the clitellum secretes a viscous substance in the form of a girdle. This girdle hardens in to a cocoon around the clitellum. The ova are discharged into cocoon. When this cocoon moves over the spermathecae openings, the sperms which are already collected from another worm and stored in the spermathecae are discharged into the cocoon. The cocoon finally, comes out of the body and fertilization takes place in the cocoon. As it is taking place outside the body, it is called as "external fertilization".
Q. How can the immune memory lead to the efficacy of vaccines and also produce allergies? Vaccines are controlled inoculations of fragments of inactive infectious agents or of
Q What are the major cells of which poriferans are made? Sponges have their external wall covered by flat cells called pinacocytes and having pores well-delimited by special ce
Q What are the kinds of cell respiration? There are two types of cell respiration aerobic cell respiration a reaction with participation of molecular oxygen (O2) and anaerobic
Define the Wealth Care Delivery ? The challenge that exists today in many countries is to reach the whole population with adequate health case services and to ensure their util
two inorganinc salts found in the body
Excretion in Non-Chordates Excretion as described under Introduction of this unit refers to removal of the waste products of metabolism - carbon dioxide (CO 2 ) and water rele
Q. What is a goiter? What is endemic goiter? How this problem is socially solved? Goiter is the abnormal enlargement of the thyroid gland the goiter appears as a tumor in the a
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Q. Of which substance do elastic fibers of the connective tissue are made? What are few functions of these fibers? The elastic fibers are made of a protein called as elastin.
Q. What are instances of nematodes? Ascaris, filaria and hookworm, all parasites of humans, are instance of nematodes also known as roundworms. Q. Are nematodes exclusively
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