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Roots and vascular transport structure and function

Organisation • Plant tissues, organs and systems

Key concepts

What you'll likely be quizzed about

  • Root hair cells possess long, thin extensions that increase the surface area for better contact with soil, facilitating greater water and mineral uptake.
  • Their thin cell walls and large permanent vacuoles minimize diffusion distance and maintain a strong water potential gradient, enhancing osmosis.
  • A high number of root hairs across roots maximizes the overall uptake surface area, significantly boosting water absorption.

Flashcards

Test your knowledge with interactive flashcards

Explain how transpiration generates the transpiration stream.

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Evaporation from leaf air spaces and stomata lowers water potential in leaves, creating tension that pulls water upward through xylem.

Key notes

Important points to keep in mind

Root hair cells increase surface area; multiple root hairs maximize overall uptake.

Osmosis moves water from higher to lower water potential; active transport moves ions against a gradient using ATP.

Xylem vessels are dead and hollow with lignified walls allowing free flow and providing support.

Transpiration creates tension that pulls water up xylem; cohesion and adhesion sustain the column.

Phloem comprises living sieve tubes and companion cells; sugar loading and unloading facilitate bulk flow from source to sink.

Translocation transports sugars for immediate use or storage as starch in sink organs.

Environmental factors influence transpiration rates and consequently xylem flow.

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