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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. Concerning permeability what type of membrane is the cell membrane? The cell membrane is a selectively permeable membrane that is it allows the passage of water and some sel
Gene targeting: There is always a debate on gene integration in to the host animal. It is random gene integration Vs gene targeting. Perhaps most significantly, pro-nuclear in
Define in brief about the biomolecules Some of the biomolecules, also known as compounds of life, form part of the structure of cell, and some of these are sources of energy fo
Explain the term Light reflex - Neuronal pathways The neuronal pathway for light reflex can be afferent and efferent. In the afferent pathway, the pupillary fibres begin in the
List the short-term and long-term effects of forest destruction (a) on hillsides, (b) in the tropics. (a) Deforestation on hillsides exposes the soil to erosion by rain and l
Q. What are fossil fuels? The Fossil fuels like coal, oil and gas, form when organic material is preserved from the complete action of decomposers, generally buried deep and un
The main causes for the rapid growth in the quantity of solid wastes are- (i) Over population: the ever increasing population is increasing all types of pollution; same is t
Define the Assessment of Copper Status in Humans? A reliable index to assess marginal copper status is currently not available. However, severe copper deficiency may be detecte
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how atoms are arranged to work in DNA?
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