IB Biology D4.2 Pub Quiz: Stability and change

What it covers

IB Biology at SL, with HL cards when you switch the level: D4.2 Stability and change.

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. Why might clearing part of the Amazon rainforest reduce the rainfall over the rest of it?
2. A forest of 400 km² is cut down to 300 km². What is the percentage change in its area?
3. A bottle garden, sealed for over 50 years, is still green and growing. What must it still get from outside?
4. Sea otters eat sea urchins, which graze kelp. What happens to a kelp forest if the otters are hunted out?
5. At Hinewai Reserve in New Zealand, old farmland smothered in gorse was left alone rather than cleared. Why leave the gorse?
6. Why do rewilding projects often bring back apex predators such as wolves or lynx?

Riddle me this

Course terms as riddles. Teams write what it is.

1. Pull me out and the whole arch of the community comes tumbling down. What am I?
2. Fertilizer feeds me, algae bloom, and then the oxygen runs out. What am I?
3. I make DDT and mercury more concentrated at every step up the food chain. What am I?
4. Push an ecosystem past me and it won't come back the way it was. What am I?
5. I'm a small sealed world in a glass vessel, where scientists test what keeps ecosystems stable. What am I?

Quickfire

Short recall from the same topics.

1. Use that can continue indefinitely
2. Threshold past which change cannot reverse
3. Small enclosed ecosystem used as a model