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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".
Ontogeny: This is the study of history of an individual. Ontogeny is also known as ontogenesis and morphogenesis. Ontogeny describes the origin or the development of an organism -
(i) Genetic Bio- Diversity: All forms of life on earth contain genes. Genes are carrier of hereditary characteristic from one generation to another. " genetic diver
Select the two correct statements out of the four (a - d) given below about lac operon. 1. Glucose or galactose may bind with the repressor and inactivate it 2. In the absenc
Q. DNA damaged by alkylating agents? 1. Some simple alkylating agents 2. Illustrations of products of alkylating agents 3.Many of these products can be repaired by excision rep
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a) Where casparian strips situated in a plant body are and what are they made up of? Mention its function. b) What is respiration quotient (RQ)? Under what conditions will th
Protein Glycosylation is the reaction in that a carbohydrate, example for a glycosyl donor that is attached to a hydroxyl or other functional set of another molecule a glycosyl acc
Benefits of Computerization Computerization were the following benefits in nursing: Improved professional care Better accuracy (by decreasing human error) Effect
Q. Illustrate Stents? Stents are metallic scaffolds that are deployed within a diseased segment of a coronary artery to establish and then maintain a widely patent lumen. Stent
Freezing Point - Properties of Solutions The freezing point of a material is the temperature at which it changes from a liquid to a solid. A liquid freezes when its vapour pre
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