Leaves and starch… | paulweeks2014

If, like me, you’re a fan of the SAPS website (Science and Plants in Schools), you’ll already be familiar with this variation on a theme. If not, read on, bated breath optional…

I think it’s a brilliant idea. Rather than testing an entire geranium leaf for the presence/absence of starch, the students cut leaf discs with a cork borer. This is an improvement for lots of reasons.

Firstly, as you can see from the picture,  the whole starch testing procedure is much easier if you’re working with small tissue samples, rather than a whopping great leaf. There’s no forcing the leaf into the…

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