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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".
What are some examples of organs and tissues where mitosis is more frequent, less frequent or practically absent? Generally in vertebrates mitosis is more frequent in a tissue
What is a terrestrial organism? 'Terra' is the Latin word for earth. Thus, an animal that lives on the surface of the earth is known as terrestrial. This is the similar root wo
Q. Is there interphase again between meiosis II and meiosis I? There is no interphase or DNA duplication between the divisions of meiosis. Only a short interval termed as diaki
Sample Outline of Child History Questionnaire Basic identifying data: Child's name Date of birth Date of evaluation Person referring for evaluation Per
What are gametes? Gametes are cells specialized in sexual reproduction. They have half of the maximum number of chromosomes of the species and unite with another gamete giving
What is the function of the umbilical cord? The umbilical cord is a set of blood vessels that connects the fetus with the placenta. In the fetus one extremity of the cord inse
What is the difference among cryptogamic and phanerogamic plants? Cryptogamic (hidden sex organs) plants are those that do not show flowers or seeds. They comprise the bryophy
Define Solubility affecting absorption of dietary iron? Solubility is crucial for non-haem iron absorption as the inorganic iron salts have to be solubilized in the intestine f
How potassium is essential for the following physiological functions It is vital for photosynthesis. When K + ion is deficient, photosynthesis declines and respiration incr
describe and compare reproduction in all the kingdoms except kingdom animalia
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