Biology 9700 · AS & A Level · Movement into and out of cells

Movement into and out of cells — practice question

Which combination of characteristics is correct for a phloem sieve tube element while it unloads into a sink?

  • Awater potential higher than sink; lignified cell wall absent
  • Bwater potential higher than sink; lignified cell wall present
  • Cwater potential lower than sink; lignified cell wall absent
  • Dwater potential lower than sink; lignified cell wall present

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