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Q.

In the activity to test the presence of starch in a leaf which solution is used?

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a

Iodine solution.

b

Oil.

c

Magnesium solution.

d

None of the above.

answer is A.

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Detailed Solution

Concept: To check the presence of the starch in a leaf first we boil the leaf and then add alcohol, this is helpful in removing the chlorophyll.

Put a few drops of iodine. The area of the leaf which has starch turns blue-black. Iodine turns into blue-black in the presence of starch.
 

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