Multiple Choice
A botanist discovered a mutant plant that is unable to produce the material that forms the Casparian strip. This plant is __________.
34. Vascular Plant Transport
Water Potential
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Root pressure is attributable to __________.
A
transpiration
B
the high water potential of the vascular cylinder relative to the root cortex
C
guttation
D
the pumping of minerals out of the vascular cylinder
E
the accumulation of minerals in the vascular cylinder
Verified step by step guidance1
Understand that root pressure is a phenomenon in plants where water is pushed up from the roots to the leaves, even in the absence of transpiration.
Recognize that root pressure is primarily caused by the accumulation of minerals in the vascular cylinder, which is part of the plant's root system.
The accumulation of minerals in the vascular cylinder lowers the water potential inside the roots compared to the surrounding soil, causing water to move into the roots by osmosis.
This influx of water into the roots generates a positive pressure that pushes water upward through the xylem vessels.
Note that while transpiration and guttation are related to water movement in plants, they are not the primary causes of root pressure. Transpiration involves water loss from leaves, and guttation is the exudation of water droplets, often seen in the morning on leaf edges.
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