In a sugar sink, such as a taproot, sugar is converted into _____.
a) glycogen
b) cellulose
c) fatty acids
d) starch
e) proteins

At a sugar sink, sugar is removed from phloem by _____.
a) osmosis
b) root pressure
c) active transport
d) diffusion
e) transpiration

Water moves into phloem by _____.
a) osmosis
b) endocytosis
c) root pressure
d) active transport
e) transpiration

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

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

_____ transport(s) sugars from leaves to, for example, taproots.
a) Blood vessels
b) Tracheids
c) Vessel elements
d) Xylem
e) Phloem

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

Tree roots are a ________ of sugars in spring and a ________ in the fall.
a) source; source
b) sink; sink
c) sink; source
d) source; sink

On the tip of the root, the apical meristem forms the ________, which prevents the meristem from being worn away as it pushes through the soil.
– cortex
– root cap
– epidermis
– endodermis
– pericycle

Under the influence of hormones, branch roots emerge from the ________ of a growing root.
– central cylinder
– endodermis
– epidermis
– Casparian strip
– pericycle