Put a small drop of water on a microscope slide. Hold the leaf with the surface ... Area = πr 2 = 3.14 × 0.20 × 0.20 = 0.13 mm 2 The number of stomata in the field of view is 12.

To be representative of the whole leaf, the representative sample must: include a sufficient number of counts - not just one or two - of stomata over different parts of the slide must be random ...