Biology 9700 · AS & A Level · Cells as the basic units of living organisms

Cells as the basic units of living organisms — practice question

Which set of features is typical of a phloem sieve tube element immediately after it has been loaded from a source?

  • Awater potential of the phloem sieve tube element: higher than source; lignification of the cell wall: not present
  • Bwater potential of the phloem sieve tube element: higher than source; lignification of the cell wall: present
  • Cwater potential of the phloem sieve tube element: lower than source; lignification of the cell wall: not present
  • Dwater potential of the phloem sieve tube element: lower than source; lignification of the cell wall: present

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