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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".
Define Metabolic Effects of Thyroid Hormones? Although (T 4 ) is quantitatively predominant, (T 3 ) is the more active form. The mechanism of action of thyroid hormones appears
The major air pollutants are: (i) Carbon monoxide, CO (ii) Nitrogen oxides, (NO)x (iii) Sulphur oxide, (SO)x (iv) Ground level ozone (O3) (v) Hydrocarbons (
XYY humans are fertile males. XXX humans are fertile females. What do these observations reveal about the mechanisms of sex determination and dosage compensation?
Q. What is tuberculosis? How is the disease transmitted? Is there treatment for tuberculosis? The Tuberculosis is a disease caused by the Mycobacterium tuberculosis bacteria wh
Q. What are risk factors for diseases? The Risk factors for a disease are everything that contributes to increase the risk of the disease to appear. For example, for most cardi
Q. What are CD4 lymphocytes? What is the relationship between these cells and HIV? How does HIV replicate? The CD4 lymphocytes are T helper lymphocytes that present in their pl
Guanine is one of the nitrogenous bases in the nucleic acids, guanine is one of the two purine bases.
Define Assessment of Selenium Status? Blood glutathione (GSH) peroxidase activity is directly related to blood selenium up to a level of 1.27 μmoles/L. Beyond this point, the a
Skeletons of radiolarians The skeletons of radiolarians and foraminiferans form a primary constituent of ocean bottoms where they form 30% or more of the sediment. It is calle
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