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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".
Considering the independent segregation of all factors, how many types of gametes does a VvXXWwYyzz individual produce? What is the formula is to determinate such number? The m
How do placental mammals reproduce? Placental mammals reproduce sexually, they have internal fecundation and they are viviparous, i.e., their embryo creates within the mother's
What are trophic levels? How many trophic levels can a food chain have? The Trophic levels correspond to positions on a food chain. thus producers always belong to the first tr
The first ever australopithecine fossil was found in 1924 at Taung, South Africa. It was the skull of a 6 year old child showing a mixture of human and ape like features. This a
Culture Conditions The culture vessels placed in suitable trays or racks, are stored on the shelves in a hygienically maintained culture room, under controlled conditions of l
On a given microscope, the numerical aperture of the objective is 1.5. The microscope is provided with a filter that selects a wavelength of 500 nm. What is the limit of resolution
What are the Elements of Heredity and variations?
How do mineral salts participate in osmotic regulation? Osmotic pressure depends on the number of particles dissolved in a solution and not on the nature of such particles. Min
how many types of respiration are?define them also
Early: Recurrence of angina soon after the patient resumes activities is either due to inadequate 1.evascula1isation or acute graft closure. In the immediate post-operative per
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