If you're teaching the structure and function of xylem and phloem, microscopes offer a great way in. Did you know that carnations are an excellent way see the spirals of lignin? Under a x10 magnification, the lignin is easily visible if you take a small scrape from the stem. There's no need to stain your slide, so this is quick, cheap and easy to do. You can then use the carnations to look at transport systems further.
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Fantastic, clearly written resource with excellent pictures to accompany. Excellent for Edexcel AS Topic 4. Thank you.
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