To find the average stoma diameter using an eyepiece graticule, measure each stoma, calibrate the graticule with a stage micrometer, and calculate the mean from numerous measurements.
To determine the mean diameter of stomata using an eyepiece graticule, measure each stoma, calibrate the graticule against a stage micrometer, and take multiple measurements to calculate a mean.
| Front | Describe how the student could use an eyepiece graticule to determine the mean diameter of stomata. [3 marks] |
|---|---|
| Back | 1. Measure (each stoma) using eyepiece graticule; 2. Calibrate eyepiece graticule against stage micrometer / ruler / graph paper; 3. Take a number of measurements (to calculate a mean); |
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