Biology 9700 Practical Notes _top_ [VERIFIED]

: A poorly constructed table loses easy marks. Your results table must have:

Step 2: Calculate the value of one eye-piece division (epd).

Understanding variables is fundamental to experimental design.

Use a thermostatically controlled water bath. Monitor it with a thermometer. pH: Use a specific, measured volume of a buffer solution. biology 9700 practical notes

Align the zero marks of both the eyepiece graticule and the stage micrometer scales.

All numbers in a column must be recorded to the same degree of precision (e.g., if one reading is 15.0, they should all have one decimal place). Structure:

You need to know when to use which test. : A poorly constructed table loses easy marks

1. Core Practical Skills (Paper 3 - Advanced Practical Skills)

Plot the independent variable on the x-axis and the dependent variable on the y-axis. Label both axes clearly with names and units.

Common subjects include catalase, amylase, or protease. Focus on controlling variables like temperature (using a water bath) and pH (using buffers) while measuring the rate of reaction through gas collection or color changes. 2. Microscopic Observation and Calibration Use a thermostatically controlled water bath

For semi-quantitative analysis, a calibration curve using serial dilutions and colorimetry can be used to estimate unknown concentrations.

Enzyme investigations (temperature, pH, substrate concentration), followed by osmosis/water potential experiments and microscopy of plant and animal cells.