how to prove that starch is prepared by leaves?
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The presence of starch in leaves can be tested by the Iodine test. When we remove chlorophyll from the leaf by boiling it in alcohol and then put two drops of iodine solution, it is colour change to blue indicates the presence of starch..........
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kristisen05:
please write it in steps
Step 1: A fresh leaf is taken. Step 2: The leaf is boiled in water for few minutes to soften the cells in the leaf. Step 3: Now, dip this leaf in iodine solution. Step 4: The color of the leaf will changes into blue black color when iodine is added to it which shows the presence of starch in it.
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Answer:
To prove that starch is prepared in leaves during photosynthesis, iodine test is done.
For this test, a plant leaf is plucked and washed then it is boiled in ethanol under water bath. Doing this the pigments are dissolved in ethanol. Now the leaf is taken out and washed under tap water, then it is dried applying blotting paper.Now on this two to three drops of iodine solution is applied and spreaded.The parts of leaf where photosynthesis occur turned blackish blue and other parts gets yellowish or orange in colour.
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