transport in plants B7 Flashcards
Function of xylem
Transports water taken from the soil by the roots, to the rest of the plant
Function of phloem
Transport and distribute sugars produced by photosynthesis (oxygen, glucose, sugars and dissolved minerals)
Position of xylem and phloem
Xylem: Inside for both, On top(leaf)
Phloem: Outside for both, On bottom(leaf)
Function of root hair cells
To collect water and mineral nutrients in the soil to be sent throughout the plant
What increases the rate of absorption of water and ions for root hair
A large surface area
The pathway of water
Root –> stem –> leaf
Root hair cell –> root cortex cells –> xylem –> mesophyll cells
Define transpiration
Loss of water vapour from leaves as mesopyll cells followed by diffusion in stomata
Explain the mechanism by which water moves upwards in the xylem
a transpiration
pull creates a tension to pull up water, helping to create a water potential gradient
that draws up a column of water molecules, held
together by cohesion
Light intensity to transpiration
- More stomata is open when light intensity increases
- When all stomata is open, increase in light does not effect transpiration
Temperature to transpiration
- Particles move faster higher the temperature
- Particles evaporate faster from the leaf and transpiration increases
Wind speed to transpiration
- Wind moves away the water particles surrounding the leaf
- Tis increases the diffusion gradient between inside and outside of leaf
- (Curve)
Humidity to transpiration
- More humidity, More water
- Reduce the concentration gradient between inside and outside of leaf
- Transpiration rate slows down as humidity increases
What is translocation
the movement of sucrose and amino acids in phloem from a source (regions of production) to a sink (region of storage or usage, where they may be used in respiration or growth).
