Biology by Bradford
Free · a revision race for your class
Snip a strip. Answer it. Race back for the next.
Grass skirts turns a revision sheet into a race. Each team’s sheet hangs on the board: three strips of ten quick questions under a taped waistband. A runner snips one question off the bottom, answers it with their partner, takes it to the checker, and only a tick earns the next strip.
How it runs
- SnipA runner cuts one strip off the bottom of their team’s sheet.
- Answer as a pairBack at the table, they write the answer on the strip. No books.
- Get it checkedThe checker reads it against the key: you, or a student holding it.
- Back for the nextA tick earns the next strip. Wrong? Back to the table to try again.
Ready-made sheets
One for every IB Biology subtopic and AP Biology topic. Pick one, set the teams, print.Theme AUnity and diversity
- A1.1 Water17 SL, 20 HL
- A1.2 Nucleic acids15 SL, 22 HL
- A2.1 Origins of cells16 strips, HL only
- A2.2 Cell structure21 SL, 24 HL
- A2.3 Viruses19 strips, HL only
- A3.1 Diversity of organisms12 SL, 17 HL
- A3.2 Classification and cladistics18 strips, HL only
- A4.1 Evolution and speciation10 SL, 18 HL
- A4.2 Conservation of biodiversity21 strips
Theme BForm and function
- B1.1 Carbohydrates and lipids18 strips
- B1.2 Proteins10 SL, 18 HL
- B2.1 Membranes and membrane transport12 SL, 18 HL
- B2.2 Organelles and compartmentalization10 SL, 19 HL
- B2.3 Cell specialization11 SL, 18 HL
- B3.1 Gas exchange16 SL, 20 HL
- B3.2 Transport13 SL, 20 HL
- B3.3 Muscle and motility22 strips, HL only
- B4.1 Adaptation to environment20 strips
- B4.2 Ecological niches20 strips
Theme CInteraction and interdependence
- C1.1 Enzymes and metabolism15 SL, 20 HL
- C1.2 Cell respiration11 SL, 19 HL
- C1.3 Photosynthesis13 SL, 20 HL
- C2.1 Chemical signalling18 strips, HL only
- C2.2 Neural signalling12 SL, 20 HL
- C3.1 Integration of body systems17 SL, 22 HL
- C3.2 Defence against disease19 strips
- C4.1 Populations and communities20 strips
- C4.2 Transfers of energy and matter20 strips
Theme DContinuity and change
- D1.1 DNA replication12 SL, 19 HL
- D1.2 Protein synthesis15 SL, 22 HL
- D1.3 Mutation and gene editing12 SL, 17 HL
- D2.1 Cell and nuclear division16 SL, 22 HL
- D2.2 Gene expression15 strips, HL only
- D2.3 Water potential14 SL, 18 HL
- D3.1 Reproduction16 SL, 24 HL
- D3.2 Inheritance19 SL, 24 HL
- D3.3 Homeostasis16 SL, 23 HL
- D4.1 Natural selection11 SL, 19 HL
- D4.2 Stability and change17 SL, 22 HL
- D4.3 Climate change16 SL, 20 HL
Unit 1Chemistry of Life
Unit 2Cell Structure and Function
Unit 3Cellular Energetics
Unit 4Cell Communication and Cell Cycle
Unit 5Heredity
Unit 6Gene Expression and Regulation
Unit 7Natural Selection
Build one for your topic
Tick what your class has covered, in any course. Free.Your sheet
Link to this pickRunning the race
Ten minutes of setup, and the room does the rest.Before the lesson
- Print one sheet per team, then the key and the tick sheet. The order on each team’s sheet is shuffled, so the numbers on the key fit every sheet.
- Tape each sheet to the board by its striped waistband. Leave a pair of scissors at each one.
- Teams of four work well: two pairs taking turns to run.
Rules that keep it fair
- One strip per pair at a time, and it is cut from the bottom.
- The answer goes on the strip before it comes to the checker.
- Right: a tick on the tick sheet and the strip goes in the pile. Wrong: back to the table, with no new strip.
- No books, no phones. Partners swap who runs.
Ways to play it
- Student checker: hand the key to a student who has finished, or who is off games for the day.
- Against the clock: most ticks in ten minutes wins.
- Clean sweep: the first team to clear its whole skirt wins; the rest keep going.
- Retrieval later: keep the wrong strips and set them as the next lesson’s starter.