9.4 Translocation

Question 1

Translocation

Answer 1

Transport of organic compounds in the phloem from source to sink

Question 2

Assimilates

Answer 2

Substance that the plant takes up. Move through apoplast

Question 3

Active loading

Answer 3

Companion cell actively transports hydrogen ions using proton pumps into surrounding cells. Creates hydrogen ion gradient between surrounding cells and companion cell

Question 4

Phloem unloading

Answer 4

Sucrose is offloaded to cells which need it by diffusing down a concentration gradient. Passive process. Loss of solutes results in rise in water potential of the phloem. Water moves to surrounding cells through osmosis. Some of it enters the transpiration stream in the xylem