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structure of a dicotyledonous root
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apoplastic pathway
water drawn into endodermal cells, pulls more behind it. due to cohesive properties of water molecules. creating a tension that draws water along the cell walls of the cells of the root cortex. little resistance as mesh like structure
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symplastic pathway
takes place across cytoplasm of cells of cortex as a result of osmosis.water passes through cell walls along tiny openings. each plasmodesma is filled with a thin strand of cytoplasm so there' a continuous column of cytoplasm from root hair to xylem
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transpiration
Evaporation of water from a plant
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effects of light
stomata open in the light but close in the dark (increase in light intensity causes increase in transpiration rate)
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effects of temperature
Alters kinetic energy of water molecules and relative humidity of the air (increase in temperatures causes increase in transpiration rate)
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effects of humidity
Affects water potential gradient between the air-spaces in the lead and atmosphere (lower humidity causes increase in transpiration rate)
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effects of air movement
changes water potential gradient by altering the rate at which moist air is removed from around the leaf (more air movement causes increase in transpiration rate)
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root pressures
increases with a rise in temperature and decreases at lower temperatures. * metabolic inhibitors prevent most energy release by respiration and cause root pressure to cease * decrease in availability of oxygen or respiratory substances cause reductio
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cohesion tension
water molecules form hydrogen bonds between one another and hence tend to stick together
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Card 2

Front

apoplastic pathway

Back

water drawn into endodermal cells, pulls more behind it. due to cohesive properties of water molecules. creating a tension that draws water along the cell walls of the cells of the root cortex. little resistance as mesh like structure

Card 3

Front

symplastic pathway

Back

Preview of the front of card 3

Card 4

Front

transpiration

Back

Preview of the front of card 4

Card 5

Front

effects of light

Back

Preview of the front of card 5
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