(11) Transport in plants Flashcards
Why do root hair cells exist?
They greatly increase the surface area of the root so they absorb a lot more water.
How does transpiration happen?
Loss of water from the mesophyll cells sets up a water potential gradient which draws water from the other cells. In turn the xylem cells supply the leaf mesophyll cells with water.
What are the functions of the transpiration stream?
- Supplies water for the leaf cells
- Carries mineral ions dissolved in the water
- Provides water to keep plant cells turgid
What does the xylem transport?
Dru- I mean water and minerals
What does the phloem transport?
Sugars, and proteins (amino acids)
Why are there more stomata on the bottom of the leaf than the top of the leaf?
Otherwise the leaf would loose too much water.
What are the factors that affect the rate of transpiration?
- Light intensity
- Temperature
- Humidity
- Wind speed
What does a potometer do?
It is a simple apparatus that measures the rate of transpiration.
