Transport in the xylem of plants
Understandings:
• Transpiration is the inevitable consequence of gas exchange in the leaf.
• Plants transport water from the roots to the leaves to replace losses from transpiration.
• The cohesive property of water and the structure of the xylem vessels allow transport under tension.
• The adhesive property of water and evaporation generate tension forces in leaf cell walls.
• Active uptake of mineral ions in the roots causes absorption of water by osmosis
• Transpiration is the inevitable consequence of gas exchange in the leaf.
• Plants transport water from the roots to the leaves to replace losses from transpiration.
• The cohesive property of water and the structure of the xylem vessels allow transport under tension.
• The adhesive property of water and evaporation generate tension forces in leaf cell walls.
• Active uptake of mineral ions in the roots causes absorption of water by osmosis
This link goes to the plant library. Click on lessons at the top and then scroll to bottom of page and click on Transpiration to do the lab. Do the activities on each page, then click next to continue.
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Skill: Measurement of transpiration rates using potometers. (Practical 7)
Skill: Design of an experiment to test hypotheses about the effect of temperature or humidity on transpiration rates. |
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Dicot leaf
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Monocot leaf
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Water plant leaf - Hydrophyte
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Application: Adaptations of plants in deserts and in saline soils for water conservation. |
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Skill: Drawing the structure of primary xylem vessels in sections of stems based on microscope images.
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Application: Models of water transport in xylem using simple apparatus including blotting or filter paper, porous pots and capillary tubing
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