9.1 Transport Systems In Dicotyledonous Plants Flashcards
When do multicellular plants need transport systems
Their metabolic demands - parts need o2 and glucose transported to them as they dont photosynthesise
Size
SA:V ratio
What system do dicotyledonous plants have
A vascular system - made up of 2 transport vessels
Xylem and phloem
What are the xylem and phloem arranged in
Vascular bundles in leaves stems and roots
Where is the vascular bundle in the stem of plants
Around the edge to give strength and support
Phloem on the outside
Xylem in the middle
Where is the vascular bundle in roots
It’s in the middle to withstand tugging strains in the wind
What is the main vein in leaves that carry the vascular tissue
The midrib
What does xylem transport and what is it made up of
Water and minerals
Made up of dead cells
What are the parts of the xylem
Xylem vessels
Xylem parenchyma
Xylem fibres
What is the structure of xylem vessels
Long hollow structures made up of columns of cells fusing together end to end
What is the xylem parenchyma
These pack around xylem vessels and store food and contain tannin deposits
What is tannin
This protects plant tissues from attack by herbivores by having a bitter taste
What are xylem fibres
Long cells with lignified secondary walls providing extra mechanical strength
What does the phloem transport and what are the parts of it
Transports food in form of organic solutes
Sieve tube element
Sieve plates
Companion cells
What are sieve tube elements
Many cells joined end to end to make hollow structures
What are sieve plates
The areas between cells that let phloem content flow through
They have perforated walls which mean tonoplasts, nucleus and organelles have to break down
