3.3 Transport In Plants Flashcards
(19 cards)
What are dicotyledonous plants?
Plants with two seed leaves and a branching pattern of veins in the leaf
What is the meristem?
A layer of dividing cells, here it is called the pericycle
What is the phloem?
Transports dissolved assimilates
What is vascular tissue?
Consists of cells specialised for transporting fluids
What is the xylem?
Transports water and minerals
What are companion cells?
The cells that help to load sucrose into the sieve tubes
What are sieve tube elements?
Make up the tubes in phloem tissue that carry sap up and down the plant. The sieve tube elements are separated by sieve plates
What are xylem vessels?
The tubes which carry water up the plant
What are plasmodesmata?
Gaps in the cell wall containing cytoplasm that connects two cells
What is a photometer?
Brief
A device that can measure the water uptake as a leafy stem transpires
What is transpiration?
The loss of water vapour from the aerial parts of a plant, mostly through the stomata in the leaves
What is adhesion?
The attraction between water molecules and the walls of the xylem tissue
What is cohesion?
The attraction between water molecules caused by hydrogen bonds
What is abhydrophyte?
A plant adapted to living in water or where the ground is very wet
What is a xerophyte?
A plant adapted to living in dry conditions
What are assimilates?
Substances that have become a part of the plant
What is a sink?
A part of the plant where those materials are removed from the transport system
For example the roots receive sugars and store them as starch
At another time of year the starch may be converted back to sugars and transported to a growing stem- so the roots can also be a source
What does source mean?
A part of the plant that loads materials into the transport system
For example the leaves photosynthesise and the sugars made are moved to other parts of the plant
What is translocation?
The transport assimilates throughout a plant
