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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".
Define nutrient requirements during the periods of pregnancy? In the previous unit, we learnt about the basic principles of meal planning and the various considerations and gui
How different are gymnosperms from bryophytes and pteridophytes? Gymnosperms are not cryptogamic as bryophytes and pteridophytes are. They are phanerogamic and so they form flo
Factors affecting the process of deep fat frying. The common factors influencing the process of deep frying include: 1. Heat- Frying temperatures ranging from 150 -190°C
Animal Fats This group consists of depot fats from domestic land animals (e.g., lard and tallow), all containing large amounts of C16 and C18 fatty acids, medium amounts of uns
Part of the endocrine system in humans, these 2 glands are small bodies located at upper end of every kidney. While these glands perform a range of functions, two of the most signi
Lentic Ecosystems Lakes are inland, depressions containing standing water. They vary considerably in area and depth. The largest lake in the world, the lake Superior in North
Chloroplasts is the disk-like organelles with the double membrane found in eukaryotic plant cells; contain thylakoids and are the site of the photosynthesis. ATP is produced durin
examples of autotrophic nutrition
Mechanics of Locomotion Among annelids, polychaetes, hence more primitive than the other two groups, show a more complex mode of locomotion. Necessarily, the locomotion in po
Surgical preparation of the bone - drill technique It is essential not to allow the bone to be heated above 47°C during preparation of the site as this will cause bone cell dea
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