Biology  by Bradford
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IB Biology D2.3 Pub Quiz: Water potential

D2.3 as a pub quiz for your class: review rounds on this subtopic, mixed with pure-fun rounds so it feels like a night out and not another test. Opens at SL; switch to HL in the builder to add the higher level cards.

Print teacher pagesPrint student pagesOpen in the builder to change it

Teacher pages are the quizmaster script and tally sheet. Student pages are the team answer sheet, handout and picture sheet. Both open ready to print, on A4 or US Letter.

What it covers

IB Biology at SL, with HL cards when you switch the level: D2.3 Water potential.

The running order

nine rounds and a handout of riddles. Review rounds are drawn from this topic each time you open the quiz, so two classes never get the same paper, and every review round can be redrawn in a click.

  1. Riddle me this review
    Course terms as riddles: "I have a head that loves water and two tails that hate it…" Teams write what it is.
  2. Close-up fun
    A tiny zoomed-in patch. What's the full picture?
  3. Fact or fiction fun
    Myths and true-but-weird facts. Teams write Fact or Fiction.
  4. Think it through review
    Scenarios, odd ones out, true or false and why, puzzles: questions to reason through. Give teams a little longer.
  5. Films in science-speak fun
    A film plot, described like a research abstract. Name the film.
  6. Who am I? Scientists fun
    Three clues, hardest first. 3 points after clue 1, 2 after clue 2, 1 after clue 3.
  7. Missing vowels: course terms review
    Your key terms with the vowels taken out.
  8. Funny animal noises fun
    YouTube clips of animals making ridiculous noises. Screen off, listen, guess, then watch the reveal.
  9. Closest wins fun
    Estimation questions. Nearest team wins the point. Doubles as the tiebreaker.

A taste of the questions

Think it through

Scenarios, odd ones out and true or false and why, from IB Biology.

  1. A red blood cell is dropped into pure water. What happens, and why?
  2. Why does a plant cell in pure water not burst, when an animal cell would?
  3. Onion skin cells are put in strong salt solution. What happens to each cell's membrane?
  4. Red blood cells are put in concentrated salt solution. What do they look like down the microscope?
  5. True or false: a cell in an isotonic solution has no water crossing its membrane at all.
  6. Why are kidneys waiting for transplant kept in an isotonic solution rather than in pure water?
Answers
  1. It swells and bursts (water enters by osmosis and no wall holds it back)
  2. Its cell wall resists (the cell becomes turgid instead)
  3. It pulls away from the cell wall (plasmolysis, as water leaves by osmosis)
  4. Shrunken with crinkly edges (crenated, as water has left by osmosis)
  5. False (water moves in and out at equal rates: dynamic equilibrium, no net movement)
  6. No net osmosis (so the cells neither swell and burst nor shrink)

Riddle me this

Course terms as riddles. Teams write what it is.

  1. I'm what happens when a plant cell loses so much water that its membrane peels away from its wall. What am I?
  2. I'm the push of a swollen plant cell against its wall, and I keep soft stems standing upright. What am I?
  3. Drop a cell into me and water rushes in, because I'm less concentrated than the cell is. What am I?
  4. I match your blood so closely that I'm safe to drip into a vein. What am I?
  5. I'm the shrunken, crinkly look a red blood cell gets after losing water to salty surroundings. What am I?
Answers
  1. Plasmolysis
  2. Turgor pressure
  3. A hypotonic solution
  4. An isotonic solution
  5. Crenation

Quickfire

Short recall from the same topics.

  1. Shell of water around each dissolved ion
  2. Water crossing a membrane to more solute
  3. Channel protein that lets water through
Answers
  1. Solvation
  2. Osmosis
  3. Aquaporin

How it runs

  1. Open it in the builder. The running order loads ready to go. Swap, add or drop rounds, or draw a round's questions again.
  2. Present it or print it. Present puts each round on the projector in 16:9 with quizmaster notes. Print gives the script, team answer sheets, a picture sheet and a tally sheet on A4 or US Letter, with no projector needed.
  3. Score it. Teams swap sheets, mark, and each plays one joker to double a round. The scores page reveals the leaderboard from last place up.

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