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Perception of Light - Floral Induction
Stimulus Leaves are found to be organs that perceive light 'stimulus', K.C. Hamner and J. Bonner showed in 1938 that even if all the leaves are stripped in a cocklebur plant and only as little as one eighth of a leaf is allowed to stay on the plant would flower in response to one short day exposure. The 'stimulus' continues to stay even when the plants are brought under non-inductive conditions. Moreover, this stimulus can be 'transferred' to another plant through grafting. Chailakhyan's classical grafting experiment using short day Nicotiana species and long day Nicotiana species clearly established this point. He suggested for the existence of 'Florigen'-a flowering hormone. So far it has not been possible to isolate the flowering hormone, although there is evidence to suggest that it consist of
For the present flowering may be considered to be controlled by the balance between GA, cytokinin and ABA.
Soil Mixing The larger soil organisms are responsible for considerable mechanical mixing and weathering of soil. The wedge-like action of roots and other underground plant orga
What is syphilis? Syphilis, also known as lues, is a disease caused by the bacteria Treponema pallidum. Before the discovery of penicillin, syphilis was a fatal disease. Today
Q. What is Peaked T-Waves? Exercise induced increase in T-wave amplitude in V2 is quite predictive of anterior wall ischaemia (specificity = 95 percent). It appears that this m
Different blood groups in man 1.Blood Group "A": Persons having this blood group will have antigen "A' on their red blood cells and antibody "B" in their plasma. 2. Blood Gr
What are Taxonomic characters Taxonomic characters Classification is done on the basis of information we have. More information gives better classification. Modern taxonomy
Q. What is an instance of a hypothesis which may explicate why there is not a big representation of the class Reptilia found in Polar Regions? Beings of the class Reptilia are
Define Root-End Resection Apicoectomy a. Examine the root surface before cutting for: cracks, anatomical variations, and quality of orthograde obturation. b. Cut the root en
Fensom and Spanner Electroosmotic Flow Hypothesis In electroosmosis the ions flow across a membrane in response to electrical gradient. Ions pull along water and other content
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Results: Largely depends on the LV function. In most centres surgical mortality is 3 to 4 percent. For patients with severe LV dysfunction the immediate and late results of sur
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