Source-Sink Relationships

Question 0

Transport:

Answer 0

Plants transports different types of sugar. Plants produce and transport sugar alcohols

Question 1

Utilization:

G3P + G3P =

Answer 1

6 carbon compound

= Glucose or Fructose or Galactose

Question 2

Storage sugar

Answer 2

Sucrose (sub n) = Starch

Question 3

Sources

Answer 3

Part of the plant that provides sugar to other parts of the plant (typically leaves) Produces more than required

Question 4

Sinks

Answer 4

Require more sugar than they can produce

Question 5

Does not produce sugar

Answer 5

Fruit
Flowers
Roots

Question 6

Produces some sugar

Answer 6

New developing leaves
shaded leaves
older leaves

Question 7

Pressure Flow Hypothesis

Step 1

Answer 7

Sugar is actively loaded into sieve tube elements by the companion

Question 8

Pressure Flow Hypothesis

Step 2

Answer 8

The increased sugar concentration passively moves water from xylem to sieve tube elements, which increases turgor pressure near the source

Question 9

Pressure Flow Hypothesis

Step 3

Answer 9

The increased turgor pressure drives the sugar and water passively to the sink which has lower turgor pressure.

Question 10

Pressure Flow Hypothesis

Step 4

Answer 10

The companion cell actively unloads sugar out of the sieve tube elements for the sink

Question 11

Pressure Flow Hypothesis

Step 5

Answer 11

Water passively moves back to xylem from the crease in sugar