When testing a leaf for starch, why is it first placed in boiling water?
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Correct Answer: Option D
Explanation:
To test for the presence of starch in a leaf, the leaf is first placed in boiling water for half a minute to kill it; it is then decolourized in hot alcohol; followed by dipping in hot water to soften it. Iodine solution is then added.
NB: killing the leaf means stopping the chemical reactions
To test for the presence of starch in a leaf, the leaf is first placed in boiling water for half a minute to kill it; it is then decolourized in hot alcohol; followed by dipping in hot water to soften it. Iodine solution is then added.
NB: killing the leaf means stopping the chemical reactions