Biology 9700 Practical Notes _top_ Jun 2026

Add iodine solution. A blue-black color indicates a positive result.

To succeed, you need to be proficient in a range of standard laboratory techniques. The following notes cover the most common and high-yield practical skills you will need to demonstrate.

Calculate percentage change in mass. Plot percentage change (y-axis) against solute concentration (x-axis). The point where the line of best fit crosses the x-axis (0% change in mass) represents the internal water potential of the plant tissue. 4. Microscopy, Drawings, and Calibration

Measure the volume of oxygen released using a gas syringe or by counting bubbles per minute. biology 9700 practical notes

Immerse equal-sized potato cylinders or onion epidermal strips into a serial dilution of sucrose or sodium chloride solutions.

Confirm you'd like that full practical handbook (it will be long). If so, do you prefer:

That word haunted her.

Shows the distribution of different tissue types (e.g., epidermis, cortex, vascular bundles). Do not draw individual cells.

Add equal volumes of Benedict's reagent and the sample solution to a test tube. Heat in a boiling water bath (at least 80°C) for 5 minutes. Color Progression: Blue (None) →right arrow Green (Traces) →right arrow Yellow (Low) →right arrow Orange (Moderate) →right arrow Brick-Red (High concentration).

is renowned for its rigorous theoretical depth, but the Paper 3 (Advanced Practical Skills) and Paper 5 (Planning, Analysis and Evaluation) often separate the top achievers from the rest. Add iodine solution

Immerse uniform plant tissues (like potato cylinders or onion epidermal strips) in a range of sucrose or sodium chloride concentrations.

Enzyme practicals usually investigate how factors like temperature, pH, enzyme concentration, or substrate concentration alter the rate of reaction. Quantifying Reaction Rates

Use a sharp pencil to draw small, precise crosses ( ) or a dot surrounded by a small circle. The following notes cover the most common and

State that the entire experiment must be repeated at least three times to calculate a reliable mean and identify anomalous results. Essential Statistical Analysis for Biology

AS Level Biology requires proficiency with the light microscope. Calibration: