Transport in xylem 9.1 HL

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Key concepts

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Essentials

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Summary

Summary list for 9.1 Transport in xylem

Leaf stomata & transpiration

  • Leaves are adapted to absorb carbon dioxide from the air
  • therefore transpiration can also occur in leaves and water is lost to the air.

Transport in xylem

  • The structure of primary xylem vessels.
  • Xylem vessels transport water from roots to leaves to replace water lost in transpiration.
  • The cohesive and adhesive properties of water molecules allow water transport under tension in xylem and cell walls.
  • The roots cells use active transport for the uptake of mineral ions (nitrates) which causes osmosis and the absorption of water.
  • Xerophytic plants in deserts have adaptations for water conservation. 

Adaptations of xerophytes

  • Xerophytic plants in deserts have adaptations for water conservation.

Skills

  • Ability to draw the structure of primary xylem vessels in stems from microscope slides.
  • Recognition of structure and function of xylem. (essential idea)
  • Use potometers to measure transpiration rates
  • Design an experiment to test hypotheses about the effects of abiotic factors on transpiration rates.

Mindmaps

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Exam style questions

Exam style question about transport in xylem

Design an experiment to test hypotheses about the effects of abiotic factors on transpiration rates is an important skill from this topic.

Answer the question below on a piece of paper, then check your answer against the model answer below.

The rate of transpiration can be measured using a simple potometer, shown in the diagram. [3]

List three variables that should be controlled to ensure that only wind speed affected the movement of the bubble in the capillary tube.  Explain their likely affect on the bubble movement. [3]

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Extra exam question

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