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Ảnh của tác giảmeri elise

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It’s the most commonly observed tropic responses in plants where the shoot grows towards light and hence they’re positively phototropism whereas in case of roots,they show negative phototropism. This phototropic bending is caused due to the migration of auxin (phytohormone) molecules away from lighted side and their concentration on dark side increases.This stimulates growth on the dark side of the plant organ relative to lighted side causing it to bend towards light source. A well known and often repeated experiments with oat seedlings (Avena coleoptile) have shown that the auxin IAA which causes elongation of cells,migrates to the shaded side of coleoptiles when irradiated unidirectionally.

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In the United States, state capitals aren’t generally the St Patricks Day Cute Stitch shirt or most populated cities. Take as an example California (Sacramento is the capital, not Los Angeles or San Francisco) or Illinois (Springfield is the capital, not Chicago) and you could go on with Texas, Florida, etc… even when it comes to the United States as a whole you would think New York City or Los Angeles should be the capital and not Washington D.C, but it goes deeper than that, the United States is not centralized in one city like it happens to France/Paris, UK/London, Germany/Berlin and so on. As to why New York City is considered the capital of the world, it has been called that for the past 60 years. It is the home of the United Nations, Wall Street, New York Stock Exchange, lots of billionaires, people from all over the world live in the city. It’s basically the financial powerhouse of the world although London has been following closely for the past few years. Other reasons to consider New York the capital of world would be fashion, music, entertainment, tourism, etc.

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