Question

7. How do you test for starch?​

Answer 1

Test for Starch

Take small quantity of the food items to be tested.

Put 2-3 drops of iodine solution on it.

Observe the colour of the food item.

Blue-black colour indicates the presence of starch in the tested food item

Answer 2

Answer:

Test for Starch in Plants Source

1).Test-for-the-presence-of-starch

Materials Required

Knife

Spatula

Porcelain tile.

Iodine solution

Food sample – Potato or any other vegetables or fruits.

2).Procedure

Take a fresh Potato which is washed, cleaned and dried.

Peel off the skin of the potato.

Cut the potato into small cubes or slices.

With the help of clean and dried Spatula, place the potato samples on the clean and dried porcelain tile.

Add 2 to 3 drops of dilute iodine solution on the potato samples.

Keep the slide undisturbed and observe the changes.

3).Observations

There will be a change in colour. A blue-black colour develops on the slice or cubes of the potato samples.

4).Result

The result is positive.

According to the observation the food sample or the potato slice turned to blue-black on adding the iodine solution. This proves the presence of starch in the given plant source.

This was a simple experiment which is used to check for the presence of starch. This Iodine Test for Starch can be performed for both the liquid and solid food samples.

Explanation:

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