A. The tendency for water vapor to move toward a region of lower water vapor concentration is an example of
- active transport
- osmolarity
- diffusion
- reverse osmosis
- passive transport
B. Water enters the xylem tissue from surrounding root cells due to
- osmosis
- active transport
- facilitated diffusion
- pressure pumping
- pressure flow
C. Water moves from the soil into the root by
- active tranposrt
- passive transport
- facilitated transport
- osmosis
- facilitated diffusion
F. When a large amount of water enters a plant cell, what happens?
- Entry of water increases turgor pressure in the cell.
- Entry of water increases as water concentration in the cell increases.
- Water moves toward the region of more positive water pressure.
- Entry of water reduces the turgor pressure.
- Entry of water cuases increased active transport into the cell.
H. The cohesion-tension model explains how
- water is lost from stomata
- water is transported in the xylem
- water and minerals enter the root
- mineral ions move through the xylem
- guard cells minimize water loss from leaves
I. If water in the xylem is under tension, what will happen if you cut the stem?
- Water will spurt out of the xylem.
- Water will stay at the cut surface.
- Air will be pulled into the xylem.
- The cut surface will form bubbles if placed under water.
- Water will run out of the stem if placed under water.
K. Transport through xylem
- stops if the tissue is killed
- can occur simultaneously in both directions
- requires living conducting cells
- requires negative pressure (tension)
M. The fact that water transport continues as long as leaves are alive and active indicates that
- leaves pump water
- leaves are necessary for transport of water
- roots are active
- water is not needed for leaves to remain alive
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Answers: A3, B1, C4, F1, H2, I3, K4, M2