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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.
The normal flow pattern cross-mitral valve is a tall E wave where is due to early rapid filling and small A-wave which is due to atrial contraction. E/A ratio >1. Pulmonary
In systematic four types of relationships are studied and they are: a) Relationships of phylogeny (evolutionary descent) or the degree to which two organisms are thought to be r
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EMERGENC E OF CONTEMPORARY BIOLOGY - 1 . Aristotle (384-322BC) - Greek Classified animal species and arranged them in hierarchies. Formulated 'Great chain of
what is ecological pyramids
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What are fluid and deposit feeding in holozoic animals
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