Biology  by Bradford
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D4.2 Stability and change: grass skirts

22 quick questions on stability and change, 17 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. Use that can continue indefinitely
  2. Organism whose loss reshapes a community
  3. Clearing trees, e.g. in the Amazon basin
  4. Top layer of land lost to wind and rain
  5. Nutrient enrichment of water
  6. Sudden surge of green growth in a lake
  7. Toxin concentration rising up a food chain
  8. Polymer fragments under 5 mm long
  9. Restoring natural processes, e.g. wolves
  10. Threshold past which change cannot reverse
  11. Small enclosed ecosystem used as a model
  12. Nutrients washed out of soil by rain
  13. Measure of O₂ used by decomposers in water
  14. Toxin build-up within one organism's body
  15. Insecticide that thinned birds' eggshells
  16. Toxic metal that builds up in large fish
  17. Large debris that entangles sea animals
  18. Life colonizing bare rock with no soil
  19. First colonists, such as lichens
  20. Stable final stage, e.g. forest
  21. Community stages that repeat in a loop
  22. Change halted by grazing or burning

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