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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".
How do adhesion and cohesion help plants move materials?
How are the concepts of DNA, gene, proteins and characteristics of living beings related? Characteristics of organisms depend on chemical reactions that happen in them. These r
How is the circulatory system of birds characterized? Birds, as every vertebrate, have a closed circulatory system. The heart is same to the mammalian heart, having four chambe
Physical Lay Out: Physical lay out of the nursing unit should be planned and built in such a manner so that it helps the head nurse to discharge her duties/carry out her resp
Explain the Structure and Functions of Kidney You would have got a clear idea as to where the kidneys are situated. Yes, the kidneys are located in the posterior part of the ab
Histone methyl transferases (HMTs) having a protein domain called SET. This domain is responsible to adding methyl groups to histones. Which of the following is a false statement r
What are the main human diseases caused by prions? The main called human diseases of such type are the Creutzfeldt-Jacob disease (CJD), the kuru and the Gerstmann-Sträussle-Sch
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What is the primary structure of a protein? What is the importance of the primary structure? Ans) The primary protein structure is the linear sequence of amino acids that produc
Define the Food microbiology, mycology and toxicology? Use of yeasts, moulds and bacteria in production of foods and food ingredients; microbes in fermentation, processing and
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