Biology for IGCSE & O level - Plant Nutrition (Section 7 - No. 25)
In the experiment to test for starch in a leaf, what is the purpose of boiling the leaf in water?
To remove the chlorophyll
To kill the leaf and stop its metabolic processes
To soften the leaf
To make the leaf more permeable to iodine
Explanation
Boiling stops enzymatic reactions that would interfere with the test. It also makes the cell walls more permeable.
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