sigma9012
Badges: 7
Rep:
?
#1
Report Thread starter 4 years ago
#1
Can someone describe the structure of the xylem and the function an structure bordered pits etc...?
0
reply
niamhdoesmaths
Badges: 21
Rep:
?
#2
Report 4 years ago
#2
Hi there, I've just moved this thread so you might be more likely to get a response
0
reply
LexiLoo2
Badges: 3
Rep:
?
#3
Report 4 years ago
#3
The Structure & Function of Xylem
  • Xylem vessels are very long, hollow structures formed from cells (vessel elements) joined end to end.
  • The cells have no end walls which forms a continuous hollow column.
  • The cells are dead and contain no cytoplasm and no nuclei.
  • Xylem has two main functions: 1. Transport water and mineral ions from the roots to the shoots and leaves 2. To provide support
  • Xylem parenchyma are thick-walled cells which pack around xylem vessels, storing food and containing tannin deposits. Tannin is a bitter-tasting chemical that protects plant tissues from attack by herbivores.
  • Xylem have lignified walls which helps support walls, stopping them from collapsing inwards. Lignin can be laid in the walls as rings or spirals, which allows flexibility and prevents the stem breaking.
  • Xylem have small unlignified areas called bordered pits. This is where water leaves the xylem and moves into other cells.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Do you think receiving Teacher Assessed Grades will impact your future?

I'm worried it will negatively impact me getting into university/college (145)
42.9%
I'm worried that I’m not academically prepared for the next stage in my educational journey (39)
11.54%
I'm worried it will impact my future career (28)
8.28%
I'm worried that my grades will be seen as ‘lesser’ because I didn’t take exams (72)
21.3%
I don’t think that receiving these grades will impact my future (34)
10.06%
I think that receiving these grades will affect me in another way (let us know in the discussion!) (20)
5.92%

Watched Threads

View All
Latest
My Feed