Biology 5090/41 Oct Nov 2024 | Cambridge O-Level Past Papers With Mark Scheme

1. Yeast Respiration Experiment | Investigating anaerobic respiration in yeast using sugar and sugar substitutes, recording gas production over time.

2. Temperature Control & Experiment Validity | Evaluating the effectiveness of maintaining water-bath temperature, impact on yeast respiration rate.

3. Measuring Volume Changes | Calculating volume increase in test tubes due to gas production, determining yeast activity levels.

4. Aerobic Respiration in Germinating Seeds | Measuring oxygen consumption using a respirometer, analyzing movement of liquid in a capillary tube.

5. Graphing & Rate Calculations | Plotting respiration data, predicting gas movement, determining respiration rate in germinating seeds.

6. Effect of Temperature on Respiration | Planning an experiment to test how temperature influences respiration rate using a controlled setup.

7. Wind Dispersal Adaptations in Seeds | Identifying and measuring features of dandelion fruit, explaining adaptations for wind dispersal.

8. Biological Measurement Techniques | Using magnification to determine actual seed length, calculating accurate biological proportions.

9. Practical Skills & Experimental Design | Ensuring accuracy in measuring respiration, identifying control variables, and evaluating experimental reliability.