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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".
why is obelia considered to be of special interest in Zoology as an animal showing an intermediate grade of organisation
Ventricular Septal Defect (VSD) In ventricular septal defect there is abnormal communication between right and left ventricle. Anatomically 90 per cent of all VSD are located
Define Classification of Chromatography - Basic Separation Technique Chromatography can be classified depending upon: Physiochemical principles/factors, The techniqu
Explain the Working Principle of Spectrophotometer? The working principle of spectrophotometer is graphically presented in Figure. Figure: Working princip
Synthesis of citratefrom acetyl CoA and oxaloacetate: Citrate synthase catalyses this aldol condensation reaction with the release of CoA. There are certain inhibitors to this re
What is the meaning of Ideometric approach Ideometric approach in the context of neuropsychological assessment emphasises the patient's premorbid functioning with reference to
simplest way to learn their classifiction
1) The presence of epicardial coronary artery stenosis caused by artherosclerotic plaques is by far the most frequent angiographic finding in any cardiac ischaemic syndrome. 2)
BAER' S LAW - It was given by K.E. Von Baer. Von Baer was the first scientist who studied the embryology systematically. According to it, in the embryonic development of an
cellis basic unit of life
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