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Summary OCR A/AS-Level Biology 3.3.1-2 Transport Tissues in Plants $4.10   Add to cart

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Summary OCR A/AS-Level Biology 3.3.1-2 Transport Tissues in Plants

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Revision summary of key knowledge from OCR A/AS-Level Biology 3.3.1-2 Transport Tissues in Plants.

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  • Chapter 3.3.1-2
  • June 26, 2023
  • 2
  • 2022/2023
  • Summary
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Transport Vessels
Xylem Vessels
 Transports water and dissolved mineral ions from roots to leaves
 Flow of water is not impeded because:
o Nos cross-walls
o No cell contents
o Lignin prevents collapse
 Living parenchyma cells act as packaging to separate and support vessels



Xylem Vessel Elements
 Dead cells aligned end-to-end to form continuous columns
 No contents (empty lumen) so doesn’t impede the flow of water
 Allows for rapid, low resistance conduction of water



Xylem Adaptations
 Narrow tubes so water column doesn’t break easily
 Bordered pits (non-lignified parts of cellulose wall) allow water to move between
vessels
 End wall is lost to allow free passage of water to next cell
 Dead cells are waterproof and have no contents
 Thickening of lignin provides support and prevents collapse



Phloem Vessels
 Transports assimilates (mainly sucrose and amino acids)
 Sucrose is dissolved in water to form sap
 Sieve tubes are made up of sieve tube elements
 End plates act as filters between sieve tube elements
 Parenchyma cells are used for storage
 Companion cells between and outside sieve tubes carry out metabolic processes to load
and unload assimilates

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