explain the procedure of the activity to know the presence of starch in the leaf writ precautions also
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Explanation:
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 coloring (chlorophyll) is removed from the leaf. The iodine reagent is then added, which causes the green areas on the leaf, where starch is supposedly present, to turn to a blue-black color. This indicates the presence of starch in the leaf.
precautions
- do not make your hand burn from boiled water.
- do it precisely as indicated
- you may take help of elders or teachers
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