Biology WBI16/01 June 2020 | Edexcel International A Level Past Papers With Mark Scheme

Edexcel International AS/A Level Biology (WBI) Jun 2020

معلم موافق رایگان بودن است.

1. starch as plant energy storage–insolubility, compact polysaccharide structure, hydrolysis to glucose during germination

2. water potential comparison in sweet vs white potato tubers–plasmolysis method, sucrose solution gradients, mass/density change analysis

3. experimental variables in osmosis–abiotic (temperature, light), biotic (tissue maturity), impact and control strategies

4. factors influencing potato cell water potential–solute concentration, vacuole size, dehydration, metabolic activity

5. insecticide effect on thistle leaf length–null hypothesis formulation, t-test analysis, mean and SD comparison, percentage difference

6. photosynthesis in Cabomba under light intensity–hypothesis testing, safety measures, preliminary trials, controlled variables, data recording, limitations of setup