Biology WBI16/01 January 2022 | Edexcel International A Level Past Papers With Mark Scheme

Edexcel International AS/A Level Biology (WBI) Jan 2022

معلم موافق رایگان بودن است.

1. tensile strength measurement of Kenaf fibres—controlled fiber length, load application, breaking force recording, cross-sectional area measurement, stress formula use

2. cellulose molecular structure—β-glucose units, 1–4 glycosidic bonds, straight unbranched chains, hydrogen bonding for microfibril formation

3. snail rehydration test—water drop volume calculation, abiotic variables (temperature, humidity), control strategies, variable impact on membrane breach timing

4. mayfly abundance survey—kick sampling method, polluted vs unpolluted stream comparison, t-test calculation, graph plotting with variability, null hypothesis testing

5. yeast respiration rate experiment—temperature as independent variable, CO₂ volume measurement, control of sugar concentration and pH, graph analysis of rate vs temperature

6. experimental planning—data table creation, quantitative result collection, error minimization, reproducibility check, statistical analysis with control variable consistency