Q1 L1 · Quiz
Weekly quiz · Learning to Test Ideas: Controlled Experiments
Assessment Appendix — AP Biology · Week 1 Quiz
Quarter 1, Week 1 · Lessons 1.1–1.2 · Learning to Test Ideas: Controlled Experiments; Water: The Molecule That Runs the Garden
| # | Item | Answer / look-fors / scoring | Pts | Lesson · standards |
|---|---|---|---|---|
| 1 | Which term best matches this description? A procedure in which a researcher deliberately changes one variable to see its effect on another; without manipulation it is an observation. | (B) experiment. | 1 | L1.1 · CED Topic 5.5; LO 5.5.A; Skill 3.A, 3.B, 3.C |
| 2 | Which term best matches this description? A comparable neighborhood that did not get trees, measured over the same summer with the same instruments; it shows what would have happened anyway. | (D) control group. | 1 | L1.1 · CED Topic 5.5; LO 5.5.A; Skill 3.A, 3.B, 3.C |
| 3 | Choose the word or phrase that best completes the sentence: An experiment changes one thing on purpose and compares the result to a ________ that is identical in every other way. Without the control, we cannot claim cause and effect. | (C) control group. | 1 | L1.1 · CED Topic 5.5; LO 5.5.A; Skill 3.A, 3.B, 3.C |
| 4 | Assuming independent assortment, what is the probability that a cross of AaBb × AaBb produces offspring with genotype/phenotype A_B_? | (C) 9/16. Use the product rule for each gene in AaBb × AaBb. | 1 | L1.1 · CED Topic 5.5; LO 5.5.A; Skill 3.A, 3.B, 3.C; item skill 5.A |
| 5 | In an onion root-tip slide, 52 of 200 cells were in a stage of mitosis. What is the mitotic index? | (A) 0.260. Mitotic index = cells in mitosis ÷ total = 52/200 = 0.260. | 1 | L1.1 · CED Topic 5.5; LO 5.5.A; Skill 3.A, 3.B, 3.C; item skill 5.A |
| 6 | Short Free Response: Answer each part using evidence from this week’s garden investigations. | 4 | L1.1, 1.2 · CED Topic 5.5; LO 5.5.A; Skill 3.A, 3.B, 3.C; CED Topic 1.1; LO 1.1.A; Skill 1.B, 6.E | |
| (a) What is the difference between an experiment and an observation? | An experiment deliberately changes a variable; an observation records what happens without manipulation. | 1 | ||
| (b) Why is a control group essential? | It provides a baseline that shows what would happen without the treatment, so a difference can be attributed to the treatment. | 1 | ||
| (c) A sports drink company surveyed 50 athletes who drink its product and 80% said they felt stronger. Identify two problems with this study and describe a better design. | Problems: no control group, self-report bias, no random assignment, athletes already chose the drink. Better: randomly assign athletes to the drink or a look-alike placebo, measure a performance variable (sprint time), keep training constant, and use a large sample. | 1 | ||
| (d) Define hydrogen bond. | Attraction between a partially positive H and a partially negative O of a different molecule. | 1 |