Sugar Movement in Vascular Plants

Question 1

Phloem

Answer 1

-where plant transports sugars and other assimilates
-up and down plant (wherever needed)
-grouped in vascular bundle; in middle of leaf, stem, root

Question 2

Companion cells

Answer 2

-phloem tissues
-control transport in sieve tube elements (another phloem tissue - next to companion cells)
-control centre for actual flowing tube

Question 3

Active Transport

Answer 3

-process where movement of molecules occurs from region of low concentration to region of high concentration against a gradient
-companion cells contain many mitochondria because phloem requires active transport to move sap in translocation (transfer of assimilates through plant)

Question 4

Sources and Sinks

Answer 4

-2 cells play roles in transport of solutions of phloem
-source cell produces sucrose and load it into the phloem
-sink cell unload sucrose from phloem
-used by translocation