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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".
The DNA of a bacterial cell,such as Escherichia coli is a circular double-stranded molecule often referred to as the bacterial chromosome. The circular DNA is packaged into
What is a biosphere? A biosphere is a set of all of the ecosystems of the planet.
How can I become involved in supporting brain research? A. Here are some ways which you can support brain research: Join in activities of Brain Awareness Week. Dona
Butane and 2-methyl-propane are: Select one: a. Alcohols b. geometric isomers c. structural isomers d. Stereoisomers e. All of the above
Pre-operative and Post-operative Nursing Care of a Child with Cleft Lip: We shall begin with pre-operative nursing care and then focus on post-operative care. As you know that
Define the Role of Vitamin D in the immune system? Immune responses that are, mediated by T-cells can be inhibited by tile large doses of calcitriol i.e. 1, 25 dihydroxycholec
what are intergenic interactions ? please explain with example of cross breeding. and how we calculate the phenotype and genotype. explain epistasis, duplicate genes, supplementary
Explain Adverse effects of Stavudine Fatal lactic acidosis may happen more frequently with stavudine than with other NRTIs. Serum aminotransferase activity may enhance with sta
Why did it take 150 years for the cell theory to be developed after microscopes were invented? Information about cells could not be understood and organized into a central theo
Q How does the presence of exoskeleton describe the general small size of arthropods? Since they have periodic ecdysis and exoskeleton, the growth of arthropods is limited to a
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