Water Transport in Plants & Transpiration

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  • Created by: Voltace
  • Created on: 25-04-14 23:28
What happens in the Symplast pathway?
Water enters root cell by osmosis because lower water potential then soil, it travels from cell to cell towards xylem through the cytoplasm then holes in the cell wall 'plasmodesmata'. / It diffuses across the water potential gradient
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What happens in the Apoplast pathway?
(Water diffuses across between cell walls), (following the water potential gradient.) (It's blocked by casparian strip at endodermis) (enters cell by osmosis provides regulation) (enters xylem by symplast pathway) (Largest Volume of water)
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Two ways in which water travels up the stem?
(Cohesion & Tension) Transpiration in leaves causes low pressure in leaves, water sucked up stem to replace, water under tension (has high tensile-strength) hydrogen bonding (cohesion) / Root Pressure- uptake water by osmosis pushes water in xylem
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How do you measure Transpiration? & The formula?
Using a potometer, actually measures uptake rate, bubble moves along. Used to test different effects on transpiration. Speed of movement of air bubble x cross sectional area of cappilary tube = rate of water uptake
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What are the factors affecting Transpiration
Heat - high tempreature causes water to evaporate out of stomata Light - Stomata open for photosynthesis, transpiration bi-product Wind - blows away saturated air, increasses water potential gradient Humidity - Dry air has low water potential
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Other cards in this set

Card 2

Front

What happens in the Apoplast pathway?

Back

(Water diffuses across between cell walls), (following the water potential gradient.) (It's blocked by casparian strip at endodermis) (enters cell by osmosis provides regulation) (enters xylem by symplast pathway) (Largest Volume of water)

Card 3

Front

Two ways in which water travels up the stem?

Back

Preview of the front of card 3

Card 4

Front

How do you measure Transpiration? & The formula?

Back

Preview of the front of card 4

Card 5

Front

What are the factors affecting Transpiration

Back

Preview of the front of card 5

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