B
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1.How are tracheid cells and vessel elements similar?
A. Both are specialized phloem cells that transport sugars.
B. Both are living when they carry materials.
C. Both use energy to transport materials.
D. Both are specialized xylem cells that transport water.
2. What does the cohesion-tension theory propose?
A. Water is pulled upward in xylem when covalent bonding creates tension.
B. Hydrogen bonding in leaves pulls water up the stem.
C. Water is pulled upward in xylem when cohesion and adhesion create tension.
D. Cohesion between water molecules and the walls of xylem pulls water upward.
3. How are stomata involved in drawing water up a plant stem?
A. Adhesion occurs in the stomata, drawing water up the stem.
B. A cohesive force between water molecules and the stomata draws water up the stem.
C. Transpiration occurs in the stomata, using carbon dioxide and water as reactants.
D. Water leaves the plant through stomata, causing a vacuum that draws more water up the stem.
4. Through what cells in phloem tissue do sugars travel?
A. Sieve tube elements
B. Vessel elements
C. Companion cells
D. Plasmodesmata
5. What force does the pressure-flow model depend on to move sugars?
A. Hydrogen bonding between water and sugar molecules
B. Atmospheric pressure that presses down on sugars in the phloem
C. Adhesion forces between sugar molecules and the walls of the phloem
D. Osmotic pressure differences between the source end and the sink end of phloem
A. Both are specialized phloem cells that transport sugars.
B. Both are living when they carry materials.
C. Both use energy to transport materials.
D. Both are specialized xylem cells that transport water.
2. What does the cohesion-tension theory propose?
A. Water is pulled upward in xylem when covalent bonding creates tension.
B. Hydrogen bonding in leaves pulls water up the stem.
C. Water is pulled upward in xylem when cohesion and adhesion create tension.
D. Cohesion between water molecules and the walls of xylem pulls water upward.
3. How are stomata involved in drawing water up a plant stem?
A. Adhesion occurs in the stomata, drawing water up the stem.
B. A cohesive force between water molecules and the stomata draws water up the stem.
C. Transpiration occurs in the stomata, using carbon dioxide and water as reactants.
D. Water leaves the plant through stomata, causing a vacuum that draws more water up the stem.
4. Through what cells in phloem tissue do sugars travel?
A. Sieve tube elements
B. Vessel elements
C. Companion cells
D. Plasmodesmata
5. What force does the pressure-flow model depend on to move sugars?
A. Hydrogen bonding between water and sugar molecules
B. Atmospheric pressure that presses down on sugars in the phloem
C. Adhesion forces between sugar molecules and the walls of the phloem
D. Osmotic pressure differences between the source end and the sink end of phloem