Archived posting to the Leica Users Group, 2002/09/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Actually they do not know how a tree gets water from the roots all the way up. There are two main theories of which transpiration is currently in vogue. Transpiration is supposed to be the engine that "sucks" the water up. The other theory involves the roots pumping the water up. However there is no actual proof either way and it would not surprise me to find out we are wrong on both counts. At times it amazes me how much we do not know about seemingly simple life forms we take for granted. John Collier On Saturday, September 21, 2002, at 04:36 PM, Jeffery Smith wrote: > "The tree sucked up water..." > > Oh dear. A biological and physical impossibility. You DO need to speak > the Northwestern's resident botanist. The water is taken into the roots > by osmosis, and then carried up the rest of the way through > transpiration. - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html