Transport Systems- Plants Flashcards
1
Q
What are the plant organs?
A
- roots
- stems
- leaves
2
Q
How does water minerals enter the plant?
A
water and minerals enter the plant through root hairs, and are transported in dead xylem vessels
3
Q
Xylem?
A
- xylem vessels are hallow tubes supported by rings of lignin
- they are dead
- they transport water and minerals up the plant
- lignin provides supports and withstands pressure change
4
Q
Phloem?
A
- transports sugar up and down the plant
- is alive
- companion cells provide energy for sieve cells
- sieve cells are the one that transports sugar
5
Q
What happens when water enters guard cells?
A
when water enters guard cells the guard cells becomes turgid and the stomata opens
6
Q
What happens when water leaves guard cells?
A
when water leaves guard cells the guard cells becomes flaccid and the stomata closes
7
Q
What is transpiration?
A
transpiration is the loss of water by evaporation from the stomata
8
Q
Describe the process of transpiration:
A
- water and minerals in soil enter the root via osmosis
- water is then transported through the xylem tubes
- finally, water evaporates mostly through holes in the leaf- stomata, causing water to be drawn vin from the stem
9
Q
Why is transpiration important?
A
- it carries water for photosynthesis to the mesophyll cells in the leaves
- the water carries essential minerals in solution
10
Q
How is the rate of transpiration affected?
A
+wind speed = rate+
+humility = rate-
+temperature = rate +
+surface area = rate+
