AceDSE · 试卷 · 2026.07
生物
Biology
Experimental, Data-analysis and Systems Test
考生姓名
日期
样本依据
sample Paper 1 MCQ followed by diagram-rich structured questions, investigations and data analysis, plus elective-style application
本卷范围
A compressed Paper 1-style diagnostic. Practical skill is assessed through design and evaluation; SBA remains separate.
考生须知
- Answer all questions.
- Show calculations and include units.
- When evaluating evidence, distinguish observations from biological explanations.
Question 1 — Water loss in leaves
20 分| Temperature / °C | Bubble movement / mm in 10 min |
|---|---|
| 20 | 14 |
| 25 | 22 |
| 30 | 32 |
| 35 | 30 |
| Treatment at 25°C | Mean movement / mm in 10 min |
|---|---|
| No jelly | 22 |
| Upper surface coated | 19 |
| Lower surface coated | 5 |
| Both surfaces coated | 2 |
1(a)
Calculate the mean rate of water uptake at 30°C per cm² of leaf area. The capillary cross-sectional area was 0.50 mm² and total leaf area was 80 cm². Express the answer in mm³ min⁻¹ cm⁻².
[4 分]
1(b)
Explain the trend from 20°C to 35°C. Your answer must account for the fall between 30°C and 35°C.
[5 分]
1(c)
Use the petroleum-jelly results to infer the distribution of stomata on this species. State one limitation of the inference.
[4 分]
1(d)
Design a follow-up experiment to test the effect of relative humidity independently of temperature. Include the independent variable, four controls, a reliability measure and a suitable display of results.
[7 分]
Question 2 — Inheritance, regulation and selection
20 分| Time after glucose drink / min | Person P / mmol L⁻¹ | Person Q / mmol L⁻¹ |
|---|---|---|
| 0 | 5.6 | 5.1 |
| 30 | 10.8 | 8.1 |
| 60 | 11.2 | 6.7 |
| 120 | 9.4 | 5.3 |
2(a)
A rare condition is caused by a recessive autosomal allele a. Two unaffected carrier parents plan a second child. Calculate the probability that the child is (i) affected and (ii) an unaffected carrier. If an existing child is known to be unaffected, find the probability that this child is a carrier.
[6 分]
2(b)
Compare the glucose responses of P and Q. Suggest a hormonal explanation and one further measurement that would distinguish reduced insulin secretion from reduced target-cell response.
[7 分]
2(c)
After an antibiotic was used, the resistant fraction of a bacterial population rose from 0.2% to 38%. Explain why it is incorrect to say that the antibiotic deliberately caused bacteria to make the useful mutation. Give one practice that slows this change and explain why.
[7 分]
所有题目及图表均为 AceDSE 原创；官方样本只用于校准形式、难度及思考层次。
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