Write down the activity which shows that leaves contain starch.
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To test leaves for the presence of starch,the leaf is boiled in water and then the boiled leaf is placed in a boiling tube containing 90% ethanol (ethyl alcohol). The ethanol boils and the green colouring (chlorophyll) is removed from the leaf.
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A student performed starch test on a leaf. Four steps involved in the test are shown below :
The correct sequence of steps should be
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