Biology for IGCSE & O level - Plant Nutrition (Section 7 - No. 6)
In the starch test, why is the leaf rinsed with hot water after it has been boiled in ethanol?
To remove excess iodine
To soften the leaf
To rehydrate the leaf.
To stop the action of the ethanol
Explanation
Rehydration helps the leaf to regain some of its original structure and becomes more receptive to the iodine.
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