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Push/pull Theory
Part 1 of Paper
....r than a human of comparable weight. At least 500 pounds of water must be lifted from the roots to the leaves to make a single pound of organic tissue. This tremendous amount of water is required to undergo photosynthesis each and every day of a plant's life. But how does a tree lift hundreds of gallons of water hundre.... Part 2 of Paper
.... evaporation. When the xylem is full of water, the molecules will not move back down the structure, but rather need to be expelled from the plant. They will move, by the process of osmosis, to an areas where there is the least amount of pressure. These areas are usually openings located on plant leaves. Once the water molecules reach the leaves, the excess water will be forced out of the plant by root pressure.
This push theory presents two major inconsistencies 1)many plants exhibit no root pr.... |
| Number of words: 906 - Approximate pages: 4 |
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