Back
to top
Mass Transport in Plants
Watch
Announcements
Page 1 of 1
Go to first unread
Skip to page:
What are the 3 points of evidence for mass flow associated with the companion cell and then what is the evidence for mass flow associated with the phloem?
0
reply
Report
#2
Evidence of mass flow associated with the phloem are that:
1) When the phloem is broken sap flows out indicating an outward pressure
2) There is a higher concentration of sugar in the source (leave cells) than in the sink (root cells)
3) Increases in sugar conc. in the leaves lead to a similar increase in sugar conc. in a phloem
4) Flow in the phloem occurs in the day but ceases at night
Evidence for mass flow associated with the companion cell:
1) companion cells have lots of mitochondria and produce lots of ATP (for active transport of sugars, therefore creating low water potential in phloem)
I'm not sure about the other 2 points of evidence. Perhaps that companion cells surround the seive tube elements? Hope this helped though
1) When the phloem is broken sap flows out indicating an outward pressure
2) There is a higher concentration of sugar in the source (leave cells) than in the sink (root cells)
3) Increases in sugar conc. in the leaves lead to a similar increase in sugar conc. in a phloem
4) Flow in the phloem occurs in the day but ceases at night
Evidence for mass flow associated with the companion cell:
1) companion cells have lots of mitochondria and produce lots of ATP (for active transport of sugars, therefore creating low water potential in phloem)
I'm not sure about the other 2 points of evidence. Perhaps that companion cells surround the seive tube elements? Hope this helped though
0
reply
(Original post by Renn0)
Evidence of mass flow associated with the phloem are that:
1) When the phloem is broken sap flows out indicating an outward pressure
2) There is a higher concentration of sugar in the source (leave cells) than in the sink (root cells)
3) Increases in sugar conc. in the leaves lead to a similar increase in sugar conc. in a phloem
4) Flow in the phloem occurs in the day but ceases at night
Evidence for mass flow associated with the companion cell:
1) companion cells have lots of mitochondria and produce lots of ATP (for active transport of sugars, therefore creating low water potential in phloem)
I'm not sure about the other 2 points of evidence. Perhaps that companion cells surround the seive tube elements? Hope this helped though
Evidence of mass flow associated with the phloem are that:
1) When the phloem is broken sap flows out indicating an outward pressure
2) There is a higher concentration of sugar in the source (leave cells) than in the sink (root cells)
3) Increases in sugar conc. in the leaves lead to a similar increase in sugar conc. in a phloem
4) Flow in the phloem occurs in the day but ceases at night
Evidence for mass flow associated with the companion cell:
1) companion cells have lots of mitochondria and produce lots of ATP (for active transport of sugars, therefore creating low water potential in phloem)
I'm not sure about the other 2 points of evidence. Perhaps that companion cells surround the seive tube elements? Hope this helped though
0
reply
X
Page 1 of 1
Go to first unread
Skip to page:
Quick Reply
