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Question

Write the steps involved in the starch test.


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Solution

Destarching of a plant:

Destarching of a plant is important for testing the presence of starch in a plant.

The steps for the process of destarching of a plant include:

Step 1: Keep the plant in a dark room:
Keep a healthy green plant in a dark room for 24-48 hours. This is done to make sure that the plant uitilises all the stored food and the leaves become devoid of any starch.

Step 2: Cover a particular part of any leaf:
Cover a part of any leaf of this plant on both the sides with a piece of black paper firmly fixed to the leaf blade.

Step 3: Expose the plant to sunlight:
Now, put this plant back into bright light.

Step 4: Decolorise the leaf:
After few hours, remove the leaf and decolorise it in boiling water, using alcohol.

Step 5: Add iodine solution:
This is done to test the presence of starch in the leaf.


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