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Push/pull Theory
Beginning of essay
Plants need much more water to survive than animals do, a sunflower must take in 17 times more water 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 u ....
Middle of essay
....root pressure.
This push theory presents two major inconsistencies 1)many plants exhibit no root pressure and 2)root pressure is not strong enough. In many plants and trees, there is a substantial amount of root pressure that could possibly explain the movement of so much water throughout a tree, defying gravity. However, in many plants, root pressure is not nearly enough to exert the amount of force needed to circulate such large quantities of water throughout the plant and against gravity. T.... |
| Number of words: 906 |
Approximate pages: 4 |
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