2006-09-26 14:51:04 · 3 answers · asked by Dwight D 1 in Science & Mathematics ➔ Biology
Nop...water moves by osmosis..from a high water potential to a low water potential through a partially permeable membrane. The reason water can reach the top of a red wood tree is due to pressure created in the xylem (root pressure) which pushes water up the xylem. The reason water can move so far up is due to adhesion and cohesion properties. These keep the column of water unbroken due to hydrogen bonding between the molecules of water and also with the membranes of the xylem. Evaporation from the leaves results in water moving back into the leaf, from the xylem, into the cells via osmosis. This draws more water up through the xylem to replace the water which is being lost from the mesophyll cells via evaporation. Active transport does not take place.
2006-09-27 09:28:23 · answer #1 · answered by jo88 2 · 0⤊ 0⤋
Hi. Yes. Consider the giant redwood tree. An efficient pump could only raise the water in the tree to about 32 feet, yet water reaches the top of the tree hundreds of feet up.
2006-09-26 21:56:06 · answer #2 · answered by Cirric 7 · 0⤊ 1⤋
active transport i thought was only for solutes...water is transported through osmosis.
2006-09-26 22:16:33 · answer #3 · answered by cherrydevil119 3 · 0⤊ 0⤋