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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".
Protonephridia and Metanephridia Nephridia take place in two major forms - the protonephridium and metanephridium. Protonephridia are found in flat worms. The protonephridial
Q. Evaluate the texture of various foods? A number of instruments are available to evaluate the texture of various foods. Brief discussions on these instruments follow. Cons
Permanent Wilting Percentage (PWP) It is the percentage of moisture in the soil at which a plant wilts and does not recover unless water is added to the soil. PWP for clay is
SPLEEN Largest lymph gland, also with myeloid tissue is an important specialized reticuloendothelial organ in vertebrates, as the site of erythropoiesis. Splenic tissue i
Q. Prevention and Control of Staphylococcal food poisoning? Staphylococcal food poisoning can be prevented by: 1. Avoiding contamination of food with S. aureus. 2. Prev
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Name two possible why the number of live bacteria cell have reached the stationary growth by 60hrs and start to die off after 12hrs?
What are the structures that participate in the human auditory sensitivity? The structures of the human auditory sensitivity are the ears (external, middle and internal), the
Q. How does photosensitivity in annelids, cnidarians and worms differ from insects, cephalopods and vertebrates? In the first mentioned group of animals there are photoreceptor
What are examples of nematodes? Ascaris, hookworm and filaria, all parasites of humans, are instance of nematodes (also called as roundworms).
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