Transpiration and Translocation(Phloem,Xylem) Flashcards
1
Q
Describe a Xylem cell
A
An elongated hollow tube, strengthened by lignin, it has no ends
2
Q
What is ‘Transpiration’?
A
The loss of water from leaves
3
Q
Why does transpiration occur in leaves?
A
During high light intensities or high temps, the guard cells open and take in CO2 for photosynthesis and in turn loose some water. The Xylem cell then transports water up to replace the lost water molecule
4
Q
What does the Phloem tubes transport?
A
They transport food substances like dissolved sugars for immediate use or storage
5
Q
Mention 4 factors that can affect transpiration
A
Light intensities
Temperature
Air flow
Humidity
6
Q
What’s the role of guard cells?
A
To control gas exchange and water loss
