B2- Transpiration And Translocation Flashcards
What are phloem tubes primarily responsible for transporting?
Food substances (mainly dissolved sugars)
Phloem tubes transport food made in the leaves to the rest of the plant.
What is the structure of phloem tubes?
Columns of elongated living cells with small pores
The pores allow cell sap to flow through.
In which directions do phloem tubes transport food?
Both directions
What is the process of transporting food in plants called?
Translocation
What is cell sap made up of?
The substances being transported and water
What is the primary function of xylem tubes?
To carry water and mineral ions from the roots to the stem and leaves
What is the structure of xylem tubes?
Made of dead cells joined end to end with no end walls
Xylem tubes have a hole down the middle and are strengthened with lignin.
What is the movement of water from the roots through the xylem called?
Transpiration stream
What causes transpiration in plants?
Evaporation and diffusion of water from a plant’s surface
Where does most transpiration occur in a plant?
At the leaves
What happens as water evaporates from the leaves during transpiration?
More water is drawn up from the roots
What role do stomata play in transpiration?
They allow gases to be exchanged easily
Fill in the blank: Transpiration is a side-effect of the way leaves are adapted for _______.
Photosynthesis
True or False: Xylem tubes are made of living cells.
False
What material strengthens xylem tubes?
Lignin
