Summary
Summary Topic 8: Transport in plants
- Course
- Institution
- Book
Topic 8: Transport in plants: IGCSE Biology course notes which will help you study for your papers. By studying these notes I achieved a 9 - A* on my Igcse
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
IGCSE Biology Topic 1 (Characteristics & Classification of Living Organisms)
-
Class notes biology: Characteristics of living organisms
-
Class and mark scheme notes Biology Cambridge IGCSE with Biology Coursebook with CD-ROM
Seller
Follow
alejandrahuartealfaro
Content preview
TOPIC 8: TRANSPORT IN PLANTS8.1 TRANSPORT IN PLANTS
-Plants have a system to transport the water, nutrients and minerals they need
from the roots to the leaves.
-Plants contain two types of transport vessel:
→Xylem vessels – transport water and minerals from the roots to the stem and
leaves.
-Made of dead hollow cells joined end to end and have cell wall made of
cellulose and lining.
→Phloem tubes – transport food materials (mainly sucrose and amino acids) made
by the plant from photosynthesising leaves to non-photosynthesising regions in the
roots and stem.
-Made of many cells joined end to end and have holes in them.
-These vessels are arranged throughout the root, stem and leaves in groups called
vascular bundles (a group of xylem vessels and phloem tubes).
8.2 WATER UPTAKE
-Plants take water from the
soil (through the root hairs)
which is carried by xylem
vessels to all parts of the plant.
-The tip of the root hair is called the root cap and it’s a layer of cells that
protects the root as it grows through the soil.
→Root hairs: single-celled extensions of epidermis cells in the root.
-They grow between soil particles and absorb water and minerals from
the soil
-Water enters the root hair cells by osmosis
-This happens because soil water has a higher water potential than the
Root hair cell from a cytoplasm of the root hair cell.
microscope:
How the Large Surface Area of a Root Hair Cell is Useful
-The root hair increases the surface area of the cells significantly
-This large surface area is important as it increases the rate of the absorption of water by osmosis
and mineral ions by active transport
Pathway of Water through Roof to Leaf
1) Osmosis causes water to pass into the root hair cells, through the root cortex and into the
xylem vessels:
2) Once the water gets into the xylem, it is carried up to the leaves
where it enters mesophyll cells.
-So the pathway is:
root hair cell → root cortex cells → xylem → leaf mesophyll cells
INVESTIGATION:
1) The pathway can be investigated by placing a plant (like celery)
into a beaker of water that has had a stain added to it (food colouring will
work well)
2) After a few hours, you can see the leaves of the celery turning the
same colour as the dyed water, proving that water is being taken up by
the celery
3) If a cross-section of the celery is cut, only certain areas of the stalk
is stained the colour of the water, showing that the water is being carried
in specific vessels through the stem – these are the xylem vessels
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 alejandrahuartealfaro. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.35. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
70055 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now