Biology 9700 · AS & A Level · Structure of transport tissues

Structure of transport tissues — practice question

Which row gives the correct pairing of the structure and function of phloem sieve tube elements?

  • Aperipheral cytoplasm with no nucleus - to provide as little resistance to flow as possible
  • Bend walls modified to form sieve plates - to slow down the rate of transport of solutes
  • Celongated cells joined end to end - to form a tube to transport dissolved mineral ions and water
  • Dcellulose cell wall with no lignin - to prevent loss of water

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