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Practice Listening: Select Missing Word
ID: #36468
Short
Atmospheric pressure
Transcript:
Atmospheric pressure can support a column of water after ten meters high, but plants can move water much higher. The sequoia tree can pump water to its very tough, more than one hundred meters above the ground. Until the end of the nineteenth century, the movement of water in trees and other tall plants was a mystery. Some gardeners hypothesized that the living cells of plants acted as palms, but many experiments demonstrated that the stance of plants in which all the cells are killed can still move water to appreciable heights. Other explanations for the movement of water in plants have been based on root pressure, a push on the water from the roots at the bottom of the plant. The root pressure is not nearly great enough to push water to the tops of tall trees. Furthermore, the conifers, which are among the tallest trees, have unusually low.
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