Apoplast Pathway

Question 1

Apoplast Route 1/6

Answer 1

​​Hydrogen ions (H+) are actively pumped out using ATP.

Question 2

Apoplast rpute 2/6

Answer 2

​Hydrogen ions return down a concentration gradient via a co-transporter protein.

Question 3

Apoplast Route 3/6

Answer 3

Sucrose must be co-transported with H+ ion, in order for the H+ ion to get back in, down the concentration gradient.

Question 4

Apoplast 4/6

Answer 4

This increases sucrose concentration in companion cells, which creates a low water potential.

Question 5

Apoplast 5/6

Answer 5

Water osmoses into the companion cell, increasing turgor pressure.

Question 6

Apoplast 6/6

Answer 6

The water carrying the assimilates then moves to an areas of lower pressure - the sinks - in a mass transport system.