Summary
Summary OCR A/AS-Level Biology 3.3.1-2 Transport Tissues in Plants
- Course
- Institution
- Book
Revision summary of key knowledge from OCR A/AS-Level Biology 3.3.1-2 Transport Tissues in Plants.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
OCR A-level Biology notes
-
OCR A-Level Biology 6.3.5 Gel Electrophoresis
-
OCR A-Level Biology 6.3.4 Polymerase Chain Reaction
Seller
Follow
izzylewington04
Content preview
Transport VesselsXylem Vessels
Transports water and dissolved mineral ions from roots to leaves
Flow of water is not impeded because:
o Nos cross-walls
o No cell contents
o Lignin prevents collapse
Living parenchyma cells act as packaging to separate and support vessels
Xylem Vessel Elements
Dead cells aligned end-to-end to form continuous columns
No contents (empty lumen) so doesn’t impede the flow of water
Allows for rapid, low resistance conduction of water
Xylem Adaptations
Narrow tubes so water column doesn’t break easily
Bordered pits (non-lignified parts of cellulose wall) allow water to move between
vessels
End wall is lost to allow free passage of water to next cell
Dead cells are waterproof and have no contents
Thickening of lignin provides support and prevents collapse
Phloem Vessels
Transports assimilates (mainly sucrose and amino acids)
Sucrose is dissolved in water to form sap
Sieve tubes are made up of sieve tube elements
End plates act as filters between sieve tube elements
Parenchyma cells are used for storage
Companion cells between and outside sieve tubes carry out metabolic processes to load
and unload assimilates
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller izzylewington04. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.88. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
66579 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now