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Vitellogenesis
Vitellogenesis is the stage where much of the oocyte growth occurs. The completion of second maturation division (meiosis), which may occur after ovulation, results in ripe egg or ovum. In some species such as sea urchins and frogs, the female produces hundreds or thousands of eggs at a time where as in most mammals including humans only a few eggs are produced in the entire lifetime of the individual. In this section we shall discuss oogenesis in two groups of animals,
(1) The amphibians as an example of organisms which produce yolky eggs and
(2) Mammals, as an example of organisms whose eggs do not contain any yolk.
How different are gymnosperms from pteridophytes and bryophytes? Gymnosperms are not cryptogamic as pteridophytes and bryophytes are. They are phanerogamic and so they form see
Exchange of oxygen, nutrients, carbon dioxide and waste products from mother to fetus takes place through diffusion across the: a) Chorionic villi (pron: core-e-on-ick villi)
Explain in brief about Life style modification Life style modification in simpler words, means diet control and doing exercises. Diet control and exercise should be planned on
Rothera's Test It is highly sensitive for both acetoacetic and acetone. Although it is one of the oldest methods still it is widely used. Procedure: - Take about 5ml of
What is the function, other than protection, of the ribs? The ribs help to alter the volume of the thorax during breathing movements.
Q. Signs of constrictive pericarditis? 1) Jugular venous pressure (JVP) is elevated in all patients of CP which reflects the elevated diastolic pressure of the right atrium.
respiration
F o wl pox Fowl pox is a contagious disease of birds, caused by a member of family Poxviridae, characterized by wart-like nodules on the skin and diphtheritic necrotic membra
Protection Against Insect Bites To minimize insect bites, travellers should wear light-colored, long-sleeved shirts, pants and socks. The most effective topical insect repelle
Q. How Linnaeus classify the plant kingdom? Linnaeus classified the plant kingdom into 24 classes in his famous work 'Genera Plantarum' (1737) and 'Species Plantarum' (1753). I
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