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

Movement into and out of cells — practice question

Which statement about the route followed by a water molecule as it moves from the soil into the xylem is correct?

  • AA water molecule in a cortex cell that takes the symplast pathway must enter the next cortex cell by passing between two adjacent phospholipid molecules in a cell surface membrane.
  • BA water molecule can pass into xylem vessels either through pits or through the cell wall of the xylem vessel elements by osmosis.
  • CA water molecule would pass into the cytoplasm of the endodermal cell if it always takes the apoplast pathway all the way to the xylem.
  • DA water molecule that has left the endodermal cells can travel by either the apoplast pathway or symplast pathway.

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