TUTTEE ACADEMY LOGO
broken image
  • Home
  • About Us
  • Subjects 
    • CHEMISTRY
    • BIOLOGY
    • PHYSICS
    • MATHEMATICS
    • PSYCHOLOGY
    • ECONOMICS
    • BUSINESS
    • COMPUTER SCIENCE
    • CHINESE
    • ENGLISH
    • SPANISH
    • IBDP IA / EE
    • IBDP TOK
    • ONLINE TUTORIAL
  • Exam Boards 
    • IBDP
    • IBMYP
    • IGCSE & GCSE
    • HKDSE
    • GCE A-LEVELS
  • Courses 
    • IBDP Tuition
    • GCE A-Level Tuition
    • IBMYP Tuition
    • I/GCSE Tuition
    • HKDSE Tuition
  • Admission Test Prep 
    • PREDICTED GRADE
    • SAT / SSAT
    • UKISET (UK)
    • BMAT
    • UKCAT / UCAT
    • LNAT
    • TMUA (Cambridge)
  • Student Results 
    • IBDP STUDENT RESULTS
    • IGCSE & GCSE MATHEMATICS
    • A-LEVEL STUDENT RESULTS
    • IGCSE STUDENT RESULTS
    • GCSE STUDENT RESULTS (UK)
    • HKDSE STUDENT RESULTS
    • OUR STORIES
  • Question Bank
  • Resources
SCHEDULE A LESSON NOW

I/GCSE Biology - Transport in Plants

Transport in Plants

· IGCSE,Biology,Plants,Phloem,xylem

Phloem 🌱

Phloem vessels consist of living cells. They have walls made of cellulose. At the end of each cell is a cross wall of cellulose with holes called a sieve plate, which link cells together, forming a sieve tube. The tubes transport products of photosynthesis from leaves to other parts of the plant. Sucrose, amino acids are carried to young leaves and other growing points. Despite being living cells, the phloem sieve tubes have no nucleus and are controlled by the companion cells. Foods flow in both directions (up and down).

xylem 🌱

Xylem vessels are made of dead cells. There is a hollow space down the middle called lumen, where water passes. The walls contain a woody material called lignin. Unlike the phloem, xylem vessels contain no cytoplasm. Their role is to carry water and minerals from the roots up the shoot to the leaves in the transpiration stream.

broken image

Water Uptake – The Roots

Roots of a plant are covered with root hair cells, which increase the surface area of the root epidermis. Each hair is a single, specialized cell of the root epidermis. The long thin outer projection penetrates between soil particles.

broken image

In I/GCSE Biology, water uptake is done by osmosis. The soil has a higher water potential than inside the cell, which causes water to move into the very first of the root hair cells. This increases the water potential in the first cells. However, the cells behind the first ones have a lower water potential, which causes water to move from the first cells to the second ones. Continuing in this way, a water potential gradient is set up across the root cortex, kept going by water being taken up the xylem (or stele, in the picture) in the middle of the root.

broken image

That's the end of the topic!

broken image

CLICK HERE TO LEARN MORE ABOUT OUR I/GCSE BIOLOGY COURSES

SIGN UP FOR AN I/GCSE BIOLOGY TRIAL NOW

Drafted by Joey (Biology)

Reference:

https://vivadifferences.com/understanding-phloem-vs-xylem-cells/

Subscribe
Previous
AS/A-Level Chemistry - Questions on reactions of...
Next
I/GCSE Biology - Reproduction in Plants
 Return to site
Profile picture
Cancel
Cookie Use
We use cookies to improve browsing experience, security, and data collection. By accepting, you agree to the use of cookies for advertising and analytics. You can change your cookie settings at any time. Learn More
Accept all
Settings
Decline All
Cookie Settings
Necessary Cookies
These cookies enable core functionality such as security, network management, and accessibility. These cookies can’t be switched off.
Analytics Cookies
These cookies help us better understand how visitors interact with our website and help us discover errors.
Preferences Cookies
These cookies allow the website to remember choices you've made to provide enhanced functionality and personalization.
Save