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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".
Q. What are the major harms caused by vitamin A deficiency? How does this vitamin act in the physiology of vision? Deficiency of vitamin A (retinol) may corneal dryness (xeroph
Post removal Technique using PRS kit -Transmetal efficiently doming the post head . -Select suitable sized trephine . -Place drop of RC prep on the post head as lubrican
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Avian tuberculosis The infection in poultry usually occurs from ingestion of contaminated food and water. The lesions develop in spleen, liver and intestines; less frequently
Describe the clinical significance and symptoms of edema. How does edema (in its different forms listed in your text) appear on medical imaging examinations? Discuss any specific c
Nitrate Uptake Nitrate must enter the cells before undergoing assimilatory reduction by the joint action of nitrate reductase and nitrite reductase. Cells accumulate NO - 3
What type of larval dispersal does Dreissenids use?
Ovipary, Vivipary and Ovovivipary In each case of external and in some cases of internal fertilisation, development of the fertilized egg (zygote) occurs outside the mother's
what are the general characteristicss of porifera
How Parasitic infections are found? Parasitic infections are found throughout the world. With increasing travel, immigration, use of immunosuppressive drugs and the spread of A
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