Describe the starch test in a stepwise manner
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a starch is a stored food or glucose in plants for bad condition . if you had to know that there is starch in a leaf you had to do a experiment in which the end of the experiment the leaf will turn blue black
to show the presence of starch in a leaf:-
first of all pluck a leaf from the plant which exposed to the sun for 5 to 6 hours. boil the leaf for 2 or 3 minutes . now place alcohol in a test tube and put it in a Beaker which is filled with water ( alcohol catches fire easily that is why you had to put in a Beaker of a test tube that is filled with water)
now boil the leaf and in the alcohol of test tube . boil the leaf till it becomes colourless.
Now, take the leaf from the test tube with a pair of forceps and wash it with water . Now , put a few drops of iodine solution on the leaf.
after few times you will observe that the colour of leaf turns black or black indicating the presence of starch
to show the presence of starch in a leaf:-
first of all pluck a leaf from the plant which exposed to the sun for 5 to 6 hours. boil the leaf for 2 or 3 minutes . now place alcohol in a test tube and put it in a Beaker which is filled with water ( alcohol catches fire easily that is why you had to put in a Beaker of a test tube that is filled with water)
now boil the leaf and in the alcohol of test tube . boil the leaf till it becomes colourless.
Now, take the leaf from the test tube with a pair of forceps and wash it with water . Now , put a few drops of iodine solution on the leaf.
after few times you will observe that the colour of leaf turns black or black indicating the presence of starch
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