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| Asked by:
Anonymous on Feb-26-2008 18:42:32 | |
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.png) | What adaptations do plants have that enable water to move upward |
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| Answer
1 Contributor: Anonymous on Feb-27-2008 13:19:18 |
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| As water evaporates from the leaves of a plant, more water is drawn up by osmosis from the tissues below to replace it. The replacement of water lost through transpiration is possible because water molecules have polar covalent bonds. This causes one end of the molecule to have a slightly positive charge and the other end to have a negative charge. Because of this, the water molecules act like "small magnets". The positive end of one water molecule sticks to the negative end of another in a long chain that is pulled upward against the force of gravity.
When enclosed in a narrow tube, such as the transport vessels of a plant, water molecules can withstand a large force without being pulled apart. | Report
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