This demo from Science and Plants for Schools demonstrates a quick and easy plant practical for biology labs. Using Universal Indicator paper, students investigate the pH of nettle stings. This can easily be built up into a broader investigation, or used as a quick practical to introduce the topics of plant defences, adaptations and specialised cells.
Download the full student sheet and teacher’s and technical notes free from the SAPS website:
Thanks AoB team! It’s a great practical – and you’d be amazed by the variation in ‘stingyness’ of nettles. I think a full research blog posting is in order.