STEP 1 STEP 2 STEP 3 STEP 4 STEP 5 Pressure Flow Hypothesis Pressure Flow Hypothesis STEP 1 Food and water enters phloem of the stem through diffusion and osmosis STEP 2 Water from xylem is transferred to the phloem to help break downdissolve food in the phloem The water pre ID: 425565
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Slide1
Transpiration in PlantsSlide2
STEP 1:
STEP 2:
STEP 3:
STEP 4:
STEP 5:
Pressure Flow HypothesisSlide3
Pressure Flow HypothesisSlide4
STEP 1: Food and water enters phloem of the stem through diffusion and osmosis.
STEP 2: Water from xylem is transferred to the phloem to help break down/dissolve food in the phloem. The water pressure is kept at low.
STEP 3: Water is being transferred in the xylem (going up) to keep balanced pressure.
STEP 4: water is being transferred from the phloem – to maintain pressure in the phloem due to excess water from xylem from step 2.
STEP 5: food is stored in the sink cell. Slide5
Movement of water in plants
Process
Explanation/details
1. Water moves down concentration gradients
Water
moves through osmosis from an area of higher to lower concentration. 2. Water lost by transpiration is replaced by water from vessels
Water moves through osmosis from an area of higher to lower concentration. Water goes from a high water potential to area of lower water potential. (analogy:
straw)3. Vessel water column is maintained due to cohesion and adhesion
Charges in water
molecules and xylem attract and repel each other to defy gravity.
4. Tension occurs in the columns of water in the xylem
A lot of water retained in xylem.
Charges in water
molecules and xylem attract and repel each other to defy gravity.
5. Water is pulled from the root cortex into xylem cells
This is caused by capillary
action – this is when something is transport throughout the system through concentration difference.
6. Water is pulled from the soil into the roots
This is caused by capillary
action – this is when something is transport throughout the system through concentration difference.