Biology  by Bradford
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D2.3 Water potential: grass skirts

18 quick questions on water potential, 14 of them at standard level, each answered in a word or two. Print a sheet for each team, a key for the checker and a tick sheet, then tape the sheets to the board and race.

How it runs

  1. SnipA runner cuts one strip off the bottom of their team’s sheet.
  2. Answer as a pairBack at the table, they write the answer on the strip. No books.
  3. Get it checkedThe checker reads it against the key: you, or a student holding it.
  4. Back for the nextA tick earns the next strip. Wrong? Back to the table to try again.

The questions on this sheet

The checker’s key, with every answer, prints with the sheets.
  1. Water crossing a membrane to more solute
  2. Solution with fewer solutes than a cell
  3. Solution with more solutes than a cell
  4. Same solute concentration as the cell
  5. Describes a plant cell swollen and firm
  6. Layer that stops a plant cell bursting
  7. Channel protein that lets water through
  8. Total solute concentration of a solution
  9. Limp: membrane not pushing on the wall
  10. Membrane pulling away from the cell wall
  11. Pumps excess water out of a protist
  12. Bursting of an animal cell taking in water
  13. Sum of ψs and ψp, in kPa
  14. Part of ψ lowered by dissolved particles
  15. Part of ψ raised by the wall pushing back
  16. Has ψ of zero at atmospheric pressure
  17. Shell of water around each dissolved ion
  18. Shrivelling of a red blood cell

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