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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".
Food Chain The land mass, water bodies and atmosphere are the three endowments of nature on which the living beings have to depend for their nourishment and sustenance. The
The human body can exhibit a wide range of resistances to current depending on the path of the current, contact area, and sweatiness of the skin. Suppose the resistance across the
Q. Explain Spray-dried milk powder? The milk which is concentrated by the process of spray drying contains about 40- 45% total solids. Do you know how the dried milk powder i
Development of Nutritional Biochemistry Nutrition, in general, and particularly nutritional biochemistry, has traveled a long way since 1926, when nutrition was first reco
Lyme disease It is a metazoonoses caused by a spirochaete, Borrelia burgdorferi. The disease based on the specific symptoms, is also known as erythema migrans (ECM) or lyme arthr
How different are gymnosperms from pteridophytes and bryophytes? Gymnosperms are not cryptogamic as pteridophytes and bryophytes are. They are phanerogamic and so they form see
Vertebrate Eye - Adult Eye There are no main differences in the structure or composition of the eyes among different vertebrates. This should be clear to you from the diagram
Characteristic Features of Coelom Sensory system consisting of eyes, photoreceptor cells, statocysts, taste buds and tactile organs. Respiration by skin, gills or par
Which of the following serves as an actuating signal, or as part of an actuating signal, in a system with feedback? (Either positive feedback or negative feedback) A. Blood pla
How is DNA replication related to cancer? Cancer can result when errors happen in the replication of DNA in genes that control how a cell divides. A mass of cancerous cells kno
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