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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".
Soil pH and Nutrient Availability Soil pH is the most important factor which governs the availability of nutrients in soil. All the nutrients are absorbed by plants in their io
Define the Prevention of Adverse Food Reactions? Considering the increasing incidence, cost and morbidity associated with allergic reactions, it is perhaps useful to design pre
Cilia and Flagella – Protozoans Cilia and flagella basically have a similar structure and distinction between the two on structural basis does not exist. There is a filament o
Explain the effect of Deficiency of Copper in Human? Owing to the remarkable homeostatic mechanisms, copper deficiency in humans is rare. However, copper deficiency has been re
If porifers shiw cell aggregate plan tgen how can they also shiw division of labour among cells
Determine the Exercises require to do diabetic patient Exercises are any bodily activity that enhances or maintain physical fitness and overall health. It is performed for stre
Q. Why is there a "popping" sound when you crack your knuckles, and is it dangerous to crack them? Some reasons have been given for the characteristic "popping" sound associate
Petrol or gasoline can be synthesized by following three methods: 1. Polymerisation 2. Fischer - tropsch method 3. Bergius process polymerisation In
Define the Agar Shake Tube Method The agar shake tube method is useful for isolation of anaerobic microorganisms. What are anaerobic microorganisms? You may recall the theory c
Observing root hairs Study the root hairs with a hand lens and view how they are constructed.
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