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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