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smm0030 smm0030
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11 years ago
And why would a decreased uptake of solutes from the soil reduce upward flow in the xylem.. can you clear those 2 ..i confused about it. thnx!
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#1
11 years ago
If the air outside is humid, it increases the water potential of the air.  This would reduce transpiration which is needed to pull water up the xylem.  If a root decreases its uptake of solutes, the water potential inside the root increases, therefore it would absorb less water from the soil.
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#2
11 years ago
increasing humidty leads to increase in the water potential outside the leaf which will decrease the potential gradient between outside and inside the leaf so the movement of water molecules from inside to outside will decrease thus reducing the upward flow of the xylem
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