Biology WBI16/01 January 2023 | Edexcel International A Level Past Papers With Mark Scheme

Edexcel International AS/A Level Biology (WBI) Jan 2023

معلم موافق رایگان بودن است.

1. Lemna minor growth rate investigation—nitrate ion concentration variation, leaflet counting, aseptic control, replication, abiotic factor standardization
2. E. coli dilution plating—bacterial risk mitigation, growth rate constant calculation using logarithmic formula, abiotic variable identification and control
3. Nereis pelagic behavioral response—light stimulus experiment, statistical analysis via t-test, null hypothesis testing, opsin-mediated photoreception
4. Brachaspis robustus population estimation—preliminary survey planning, quadrat method design, variable control (time, weather, area), data recording and statistical comparison
5. Quantitative data presentation—graph plotting of mean ± variability, hypothesis testing, conclusion drawing using t-values and critical thresholds
6. Method limitations—visibility issues due to camouflage, movement-induced counting errors, environmental variability affecting activity levels