Biology 9700 Practical: Notes

Timing: 2 hours | Weight: 23%

This paper tests your ability to manipulate equipment, make observations, and record data.

This usually involves titration, serial dilution, or enzyme kinetics.

1. The Holy Grail of Concordancy In titration experiments, accuracy is everything. You must repeat the titration until you achieve concordant results—results that are within 0.10 cm³ (or sometimes 0.20 cm³, depending on the specific instruction) of each other.

2. Significant Figures and Units This is the easiest way to lose marks. biology 9700 practical notes

3. Error Analysis You may be asked to calculate percentage error.

You must write a Null Hypothesis. Use this exact template:

"There is no significant difference between [Group A] and [Group B]. Any difference is due to chance."

You must be fluent in the tools.

| Question you ask | Data type | Test | Null Hypothesis (H₀) | | :--- | :--- | :--- | :--- | | Is there an association between two variables? | Categorical (e.g., red/white flowers) | Chi-squared (χ²) | There is no association between [variable A] and [variable B]. | | Is there a difference between two means? | Continuous, normal distribution | Student's t-test | There is no significant difference between the mean of [group 1] and [group 2]. | | Is there a correlation? | Continuous, paired data | Pearson's correlation | There is no significant correlation between [X] and [Y]. | | Is there a difference (non-normal data)? | Continuous, skewed data | Mann-Whitney U | There is no significant difference between the medians. |

By [Your Name/Study Guide]

In the high-stakes world of A-Level Biology, the theory paper is often viewed as the mountain to climb—memorizing pathways, mastering definitions, and understanding complex systems. But for many students, the true abyss lies in Paper 3 (Advanced Practical Skills) and Paper 5 (Planning, Analysis, and Evaluation).

The practical exam is not just a test of memory; it is a test of character. It tests your ability to remain calm when your titration turns pink too early, or when your microscope slide looks like a modern art painting rather than a root tip squash. Timing: 2 hours | Weight: 23% This paper

This feature breaks down the essential notes, command words, and technical nuances required to ace the Biology 9700 Practical component.

Paper 3 is the "wet lab" exam. Notes for this section usually cover three main pillars:

Examiners mark you on: