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

Show Answer

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

Show Answer

3. The movement of most minerals, including potassium into root cells is by

A. osmosis
B. diffusion
C. bulk flow
D. active transport

Show Answer

4. The evaporation of water from leaves is called

A. transpiration
B. cohesion
C. tension
D. pressure flow

Show Answer

5. Normally CO₂and O₂enter a plant by

A. osmosis
B. active transport
C. diffusion
D. evaporation

Show Answer