Transport in plants Quiz
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5 questions, one answer each
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1. Which feature of phloem sieve tube elements allows sucrose to move from cell to cell?
- A. Lignified end walls
- B. Perforated sieve plates
- C. Pits in the side walls
- D. Absence of a cell surface membrane
2. Which pathway involves water passing through plasmodesmata?
- A. Apoplast
- B. Vacuolar
- C. Symplast
- D. Xylem
3. What explains why the water column in xylem does not break under tension?
- A. Cohesion between water molecules
- B. Active transport by xylem cells
- C. Root pressure only
- D. Osmosis into the xylem
4. A plant in warm, still, humid air is moved into a draught of dry air. What happens to the rate of transpiration?
- A. It falls, because stomata close
- B. It stays the same
- C. It increases, because the water vapour gradient is steeper
- D. It increases, because the xylem is under less tension
5. Which observation is a weakness of the mass-flow hypothesis?
- A. Sap exudes under pressure from aphid stylets
- B. Sucrose concentration is higher in leaves than roots
- C. Metabolic inhibitors reduce translocation
- D. Different solutes can move in opposite directions at the same time