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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".
Ventilation of Tracheal System - Diffusion Gaseous exchange due to diffusion generally takes care of the oxygen needs of most small insects. Similarly fairly large but inactiv
economic importance
Q. How to Prepare a Key? Let us prepare a key by making a choice of. characters, listing significant and insignificant characters, tabulating these characters and forming dicho
Q. What are the two groups of defense mechanisms of the body against harmful agents or foreign? What is the difference between them? The body has many defense mechanisms agains
Q. Define Bioinert materials? Bioinert materials are chemically inert in the body and exhibit minimal chemical interaction with adjacent tissue such as titanium and alumina (Al
Fungi are a very diverse group of organisms and have a significant impact on the production, spoilage and safety of food. Molds have not only served to synthesize antibiotics but a
Define the Clinical success for the Root Canal Treatment a) Absence of pain and swelling. b) Disappearance of sinus tract. c) No evidence of soft tissue destruction, incl
Osmoregulation in Freshwater Metazoans Freshwater and brackish water animals that are live in hypoosmotic(of lower osmotic pressure) environment and keep a hyperosmotic (of h
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Define Conditions associated with increased need for Vitamin A? Conditions and populations associated with increased need for vitamin A includes young children particularly t
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