AS/A Level Biology (9700) Paper 5 Planning, Analysis and Evaluation October November 2025 Variant 51

Описание: Welcome to Ajiro Tech, your trusted guide for mastering Cambridge AS & A Level Biology (9700)!

Due to Cambridge copyright policies, we are unable to provide the solutions walkthrough here on YouTube for Cambridge International AS & A Level Biology (9700/51)
📘 Paper 5– Planning, Analysis and Evaluation
📅 October/November 2025

This video is now exclusively available in our online private tuition classes; however, you may find some videos on our Discord Community

📚 What you’ll learn in our Online Private Tuition A2 Biology Classes:
✅ How to write a complete experimental plan (independent, dependent, control variables)
✅ How to handle dilution calculations accurately
✅ How to design a fair test with good reliability + validity
✅ How to choose and justify a statistical test (t-test)
✅ How to interpret bar charts and data types correctly
✅ How to evaluate a conclusion using real biological reasoning

🧠 Topics that will be covered in our Online Private Tuition A2 Biology Classes include:
🌱 Juglone & Seed Germination (Planning Investigation)

This class will focus on juglone, a chemical released by walnut trees which diffuses into the soil and may affect seed germination and plant growth

✅ In the class, will cover:
Identifying the independent variable (juglone treatment / presence of juglone)
Dilution calculation to prepare 500 cm³ of 1.0 × 10⁻³ mol dm⁻³ solution from 0.1 mol dm⁻³ juglone stock
Improving accuracy and reducing percentage error (using pipette / volumetric flask)
Choosing a suitable control (solvent only) and why controls are needed

Full experiment method to measure:
✅ % germination
✅ seedling growth after 10 days

Why the t-test is appropriate and how to interpret t = 2.090 using the table provided

🦠 Nitrite Ions & Bacterial Growth (Analysis + Evaluation)
This class will explain the use of a microwell plate investigation at 37°C for 24 hours to test how nitrite concentration affects pathogenic bacteria population growth using optical density

✅ In this class, will cover:
Identifying other variables to standardise (volume of bacterial suspension, initial number of bacteria, volume of nitrite solution, nutrient broth amount, etc.)

Understanding the bar chart: lowest nitrite concentration where no growth occurred after 24 hours

Data types:
✅ species = categorical
✅ nitrite concentration = continuous

Calculating percentage difference between two closely related Salmonella species

Evaluating a student’s conclusion about nitrites improving health and giving 4 scientific reasons why it may not be valid

Our Online Private Tuition Classes are ideal for:
✅ A2 Biology students writing 9700 Paper 5
✅ Students who struggle with planning and evaluation questions
✅ Candidates preparing for Oct/Nov 2025
✅ Anyone aiming for top grades in Paper 5

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