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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I don’t leave everything up, but I do leave our tree up. All the Funny St Patricks Day Cheers Fuckers shirt have a special meaning, and we like to look at them, talk about them, and remember the times associated with each one. Having that glittery, softly lit beauty in the front room just gives our house some cheer in the bleak days of winter. Also, we always get a live tree, and I can’t bear to trash it until it completely dries out. It takes a long time to decorate, so all that work seems more worth it if the tree stays up a long time. One year, I left it up until St. Patrick’s Day. Usually, though, it stays up until mid- to late February. As long as it looks fresh and healthy, I leave it up. I started this tradition about 6 years ago when we had an especially beautiful tree. The day after New Year’s Day as I was about to start the take-down, I remarked that I hated to do it because the tree was so pretty. My husband said, “Just leave it up, then, if it makes you happy.” So I did. We have three sons, and I like to think they will have memories of this tradition.
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