Login

Join for Free!
118901 members


xylem upper, phloem lower

Plants!

Moderator: BioTeam

xylem upper, phloem lower

Postby mith » Thu Oct 06, 2005 1:53 am

Why is the xylem higher in the vascular bundle than the phloem? Are there any advantages?
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr
User avatar
mith
Inland Taipan
Inland Taipan
 
Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN

reply

Postby mothorc » Thu Oct 06, 2005 5:37 am

do you mean xylem inner and phloem outer?
I don't know about xylem upper and phloem lower.
User avatar
mothorc
Coral
Coral
 
Posts: 138
Joined: Sat May 21, 2005 2:27 pm
Location: Farfaraway country

Postby mith » Thu Oct 06, 2005 12:24 pm

no i do mean upper and lower, as in leaf veins actually.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr
User avatar
mith
Inland Taipan
Inland Taipan
 
Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN


Postby ERS » Thu Oct 06, 2005 1:02 pm

Visualize the leaf as an extension of the main vascular cylinder. The xylem is to the inside, so as it branches out to the leaf, the xylem will be on top.

Maybe a picture would help more. let me know.
ERS
ERS
Inland Taipan
Inland Taipan
 
Posts: 137
Joined: Thu Dec 16, 2004 5:13 am

Postby MrMistery » Thu Oct 06, 2005 6:36 pm

here, dave. Maybe it is more clear like this. Sorry i have absolutely no talent. I got an A in 5th grade for figuring this out 8)
Attachments
stem.JPG
stem.JPG (9.53 KiB) Viewed 4782 times
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
User avatar
MrMistery
Inland Taipan
Inland Taipan
 
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)

Postby mith » Thu Oct 06, 2005 6:57 pm

ah makes sense, our bio teacher blubbed about how the xylem has to be on top for better support of the leaf because it hangs the leaf as opposed to pushing it up. I thought the difference of a few cell lengths was negligible.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr
User avatar
mith
Inland Taipan
Inland Taipan
 
Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN


Return to Botany Discussion

Who is online

Users browsing this forum: No registered users and 0 guests