Plant Transport: Phloem

Question 1

Sieve tube elements are ________ at functional maturity

Answer 1

Alive

Question 2

Sieve plates are the tube cell walls, that allow fluid to flow ________ cells along the sieve tube.

Answer 2

Between

Question 3

What are companion cells?

Answer 3

Make ATP to move sucrose across cell membranes

Question 4

What is translocation?

Answer 4

Movement from one location to another

Question 5

The products of photosynthesis are transported through phloem by the process of what?

Answer 5

Translocation

Question 6

What are the products of photosynthesis? 4

Answer 6

1. Sucrose
2. Amino Acids
3. Plant Hormones
4. Minerals

Question 7

What is a sugar source?

Answer 7

An organ that is a net producer of sugar

ex. mature leaves or breakdown of starch

Question 8

What is a sugar sink?

Answer 8

An organ that is a net consumer or depository of sugar

ex. roots, buds, stems, and fruit

Question 9

Can a storage organ be both a source and a sink

Answer 9

Yes, it will receive sugar from source, but can also supply

Question 10

“Sinks” usually receive sugars from the _________ sugar sources

Answer 10

Closest

Question 11

Describe how a “source” works

Answer 11

Pump out H+ ions to pull sucrose into phloem

Question 12

Describe how a “sink” works

Answer 12

H+ pulls sucrose into a storage area

Question 13

What is the order of flow from source to sink? 4

Which has the most particles? Which has the least?

Answer 13

1. Loading of sugar (most particles)
2. Uptake of water
3. Unloading of sugar
4. Recycling of water (less particles)

Question 14

Xylem:
What moves?
What direction?
Through what tissue?
Energy requirement?

Answer 14

1. Water and minerals
2. Roots to Shoot
3. Xylem
4. Sunshine

Question 15

Phloem:
What moves?
What direction?
Through what tissue?
Energy requirement?

Answer 15

1. Photosynthesis products
2. Leaves to roots or Roots to leaves
3. Phloem
4. ATP