Okay so i've included a little about what auxins are which I have put in red (this is the same as point 2.81, so you can skip it if you have read that post). If you are an auxin wizz, just skip past the red...
Auxins are the plant hormones which control growth at the tips of roots and shoots of plants - they move to the tips of the shoots and roots in a solution (they are dissolved in water). They work by diffusing backwards to stimulate the cell elongation process which occurs in the cells just behind the tip of the shoot/root. They are involved in the growth of plants in response to light (phototropism) and gravity (geotropism).
When the tip of a shoot is exposed to light, the light dissolves the auxins. This means that there are more auxins on the shaded side of the tip (as no sunlight has shone there so the auxins have not been dissolved). This makes the cells grow faster on the shadey side, meaning the shoot will grow towards the light.
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