Transport systems Flashcards
What are the two transport systems?
Xylem and Phloem
Function of Xylem
Transport of water and minerals, support for the plant
Function of Phloem
Transport of sucrose and amino acids
Direction of transport of xylem
Upwards only
Direction of transport of phloem
Double direction
Function of root hair cells
Absorption of water by osmosis
Structure of root hair cells and their adaption
Large surface area for increased uptake of water
Pathway of water uptake
Root hair cells, cortex, xylem, spongy mesophyll cells
What is transpiration
Loss of water vapour from the leaves
Function of stomata
Control the passage of co2 by opening and closing
When does wilting occur
When cells lose more water than they uptake
Evaporated water not being replaced by soil water
Why do leaves wilt
They move downwards for protection against light
The effect of wind speed on transpiration
Transpiration increases as wind speed increases
Water molecules blown away faster from the leaves
Effect of temperature on transpiration
Transpiration increases as temperature increases
Water molecules have more kinetic energy to spread out into the airways and out of the stomata as water vapour
Effect of humidity on transpiration
As humidity increases transpiration decreases
There is as much water vapour in the atmosphere as there is in air spaces
