1. A widely accepted explanation for the transport of sugar in phloem is called
A. root pressure theory
B. transpiration
C. pressure flow hypothesis
D. cytoplasmic streaming
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2. Phloem is composed of
A. vessel elements and companion cells
B. tracheids and vessel elements
C. sieve-tube elements and companion cells
D. tracheids and sieve-tube elements
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3. The movement of most minerals, including potassium into root cells is by
A. osmosis
B. diffusion
C. bulk flow
D. active transport
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4. The evaporation of water from leaves is called
A. transpiration
B. cohesion
C. tension
D. pressure flow
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5. Normally CO2and O2enter a plant by
A. osmosis
B. active transport
C. diffusion
D. evaporation
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