Found a link that may help with the Skill 3 homework on the varnish and the leaves thing.
If you have no clue on what the varnish is for, I suggest you check it out.
http://www-saps.plantsci.cam.ac.uk/records/rec181.htm
Yes, it's about stomata size [and ours isn't], but there's this bit here that helps you understand what the varnish does when you apply it on the leaves.
2) How can you measure stomatal size? With most leaves, you can paint the surface with nail varnish and leave it to dry, then press selotape to the leaf surface and peel off the nail varnish impression and stick it to a microscope slide to measure the size of the stomata under a calibrated microscope. Now, this is almost impossible to do as the stoma is actually the hole between the guard cells and you rarely get the chance to measure the diameter of the hole - perhaps you will just have to measure the length of the closed hole and make some assumptions from there - perhaps you will just have to measure the diameter of the guard cells and make some even bigger assumptions from there.
update: found another link:
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