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Stem - Plant Growth Substances
The role of auxins, cytokinins, ethylene and abscisic acid in controlling the apical bud dominance and lateral bud dormancy (Apical Dominance) are discussed earlier. Auxins also play a role in phototropism, geotropism and other responses of stems. Auxin-cytokinin interaction regulates the differentiation and growth of shoots from callus. Gibberellins stimulate cell division and cell elongation in shoot apices. Gibberellins abolish the dwarfism (rossette conditions) in plants and promote stem elongation.
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Occurrence of Vitamin D Cholecalciferol is synthesized in the skin by the action of ultraviolet light on 7-dehydrocholesterol which is widely distributed in animal fat. Vitami
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Most of the surface water originates directly from precipitation in the form of rainfall or snow. Ground water from springs also contributes to the flow of most of the streams. The
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THEO R Y OF PANGENESIS - Proposed by Charles Darwin. According this miniature present in the every body cell i.e. called gemmule
ALIMEN T A R Y CANAL Endodermal in origin. Long, 6-9 metres. In herbivorous more long than carnivorous.
will argon tend to form bonds with other elements?
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