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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".
Explain ozone shield? Name two gases that can cause damage to this shield. Give one harmful effect of this damage each on plants and animals.
SOIL GENESIS Soil a product of evolution, is constantly changing as the landscape changes. It is a product of the interaction of five factors: parent material, climate, organis
Q. Which are the kinds of neurons that participate in the spinal arch reflex? Where are their cell bodies situated? In the arch reflex first a sensory neuron located in the gan
when does it started?
Describe Lifetime Risk Estimation ? Traditional statistical and epidemiological methods of estimating long-term risks do not accurately reflect population burden of disease. Th
What is competition? Which type of ecological interaction is competition? Competition is the ecological interaction in which the individuals explore the similar ecological nich
Define functions of magnesium - Macro minerals? Like Ca, Mg too has a role in bone formation. Soft tissue magnesium functions as a cofactor of many enzymes involved in energy m
respiratory system in amphibains
Define the Feeding and Nutritional Management of spinal trauma? The main objectives of nutritional management are to meet the nutritional needs of the initial acute phase and
Which of the following terms best describes calcium metals? Check all that apply. Molecule, element, matter, and compound.
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