Mass Flow Hypothesis Flashcards
(5 cards)
1
Q
Mass flow hypothesis
A
The mass flow hypothesis proposes that translocation occurs due to pressure gradients
2
Q
1
A
At the source, solutes like sucrose are actively loaded into sieve tube elements from companion cells, decreasing the water potential in sieve tube elements
3
Q
2
A
Water enters the sieve tube elements from the xylem and companion cells by osmosis, increasing hydrostatic pressure in the sieve tube elements at the source
4
Q
3
A
At the sink, solutes are actively removed from the sieve tube elements, increasing the water potential in sieve tube elements at the sink
4
Q
4
A
Water leaves the phloem by osmosis, decreasing the hydrostatic pressure at the sink, creating a pressure gradient, pushing solutes from the source to areas of lower pressure at the sink
