Q2 L1 · Quiz
Weekly quiz · Measuring Plant Height: Protocol, Calibration, and Measurement Error
Assessment Appendix — AP Biology · Week 10 Quiz
Quarter 2, Week 1 · Lessons 2.1–2.2 · Measuring Plant Height: Protocol, Calibration, and Measurement Error; Enzymes: Catalase in Garden Tissue
| # | Item | Answer / look-fors / scoring | Pts | Lesson · standards |
|---|---|---|---|---|
| 1 | Which term best matches this description? Unpredictable variation (leaf movement, eye angle) that averages out with more measurements. | (A) random error. | 1 | L2.1 · CED Skill 3.C, 4.B (no CED topic claimed) |
| 2 | Which term best matches this description? Consistent bias in one direction (ruler offset, always pressing into soil); it does not average out and can create a false treatment difference if applied to one cell. | (D) systematic error. | 1 | L2.1 · CED Skill 3.C, 4.B (no CED topic claimed) |
| 3 | Choose the word or phrase that best completes the sentence: Good data come from a consistent, written protocol. Random error is reduced by replication; ________ must be prevented by design. | (D) systematic error. | 1 | L2.1 · CED Skill 3.C, 4.B (no CED topic claimed) |
| 4 | Germinating seeds in a sealed chamber raised CO₂ from 450 ppm to 900 ppm in 20 minutes. What is the rate of CO₂ production? | (A) 22.5 ppm/min. Rate = Δ ÷ time = 450 ÷ 20 = 22.5 ppm/min. | 1 | L2.2 · CED Topic 3.1; LO 3.1.A; Skill 3.C, 5.A; item skill 5.A |
| 5 | Assuming independent assortment, what is the probability that a cross of Aa × Aa produces offspring with genotype/phenotype aa? | (B) 1/4. Use the product rule for each gene in Aa × Aa. | 1 | L2.1 · CED Skill 3.C, 4.B; item skill 5.A (no CED topic claimed) |
| 6 | Short Free Response: Answer each part using evidence from this week’s garden investigations. | 4 | L2.1, 2.2 · CED Skill 3.C, 4.B (no CED topic claimed); CED Topic 3.1; LO 3.1.A; Skill 3.C, 5.A | |
| (a) Explain the difference between accuracy and precision. | Accuracy = near true; precision = repeatable. | 1 | ||
| (b) Describe one systematic error you prevented today. | Systematic examples: ruler offset, measuring to a different leaf. | 1 | ||
| (c) Record the tallest plant in each cell. | Heights recorded with units. | 1 | ||
| (d) Define active site. | The region of the enzyme where the substrate binds and the reaction occurs. | 1 |