A lesson based around the practical for testing for starch in a geranium leaf.
Includes a reliable method
Technical notes
This works really well if it is prepared correctly - the plants must be de-starched in the dark for at least 2 days and then illuminated under bright light for about a day before the lesson.
In the lesson before this, the students could have made and attached their own card templates (can be done before or after the plant is de-starched).
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