Question

The solution used to test the starch in a leaf

• A. Water is used
• B. Chemical is used
• C. Iodine solution is used
• D. Alcohol is used

Answer 1

The correct option is C

Iodine solution is used

The correct option is (C)

Explanation for the correct option

1. Starch is a complex carbohydrate formed of multiple glucose units.
2. It is the stored form of food in plants.
3. An iodine solution in the presence of starch changes its color from red to blue-black.

Explanation for incorrect options

Option (A)

1. Water is a non-reactive, colorless liquid.
2. In the starch test, water is used to wash the leaf before and during the procedure.

Option (B)

1. Reactive chemicals can damage the leaf; thus, they are avoided during the starch test procedure.

Option (D)

1. Alcohol is a dehydrating agent.
2. It causes the release of green pigment from the leaf and makes the leaf dull.

Iodine solution is used to test starch in leaves.