In the cohesion-tension theory, “cohesion” refers to the:
a) use of water in photosynthesis, resulting in a shortage of water in the leaf.
b) tendency of water molecules to be attracted to minerals in the water.
c) attraction of water molecules for one another.
d) evaporation of water from the stomata of the leaf.
e) process of osmosis that pulls water into the root.
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When potassium ion is transported into guard cells, water:
a) enters by osmosis.
b) is actively transported out of the cells.
c) moves to the edge of the cell.
d) leaves by osmosis.
e) is actively transported into the cells.
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_____ is responsible for the movement of sugars from leaves to taproots; _____ is responsible for the movements of sugar from taproots to leaves.
a) Bulk flow … bulk flow
b) Bulk flow … root pressure
c) Root pressure … bulk flow
d) Bulk flow … transpiration
e) Transpiration … transpiration
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In a sugar sink, such as a taproot, sugar is converted into _____.
a) glycogen
b) cellulose
c) fatty acids
d) starch
e) proteins
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At a sugar sink, sugar is removed from phloem by _____.
a) osmosis
b) root pressure
c) active transport
d) diffusion
e) transpiration
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Water moves into phloem by _____.
a) osmosis
b) endocytosis
c) root pressure
d) active transport
e) transpiration
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The water pressure that pushes water and sugar from sugar source to sugar sink is referred to as _____.
a) translocation
b) transpiration
c) bulk flow
d) solute pressure
e) root pressure
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Sugar moves from leaves into the _____ of _____ by _____.
a) sieve-tube members … xylem … active transport
b) tracheids … phloem … diffusion
c) tracheids … phloem … active transport
d) sieve-tube members … phloem … active transport
e) sieve-tube members … phloem … diffusion
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_____ transport(s) sugars from leaves to, for example, taproots.
a) Blood vessels
b) Tracheids
c) Vessel elements
d) Xylem
e) Phloem
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Which of these processes is responsible for leaves being considered sugar sources?
a) catabolism
b) Krebs cycle
c) photosynthesis
d) citric acid cycle
e) glycolysis
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