Iodine solution is used to test Starch...

So, (Option D) Starch is correct answer.

Introduction

Iodine solution is commonly used in various laboratory tests to determine the presence or absence of certain components in food. One of the main components that iodine solution can be used to test is starch.

Testing for Starch

Starch is a complex carbohydrate found in many foods like grains, potatoes, and legumes. It is an important source of energy for our bodies. Iodine solution can be used to test for the presence of starch in food items. Here's how it works:

Procedure
1. Take a small amount of the food item to be tested and place it on a clean white plate or surface.
2. Add a few drops of iodine solution to the food sample.
3. Observe the color change.

Results
- If the food item turns dark blue or black, it indicates the presence of starch.
- If the food item remains unchanged in color, it suggests the absence of starch.

Explanation
Iodine solution reacts with starch to form a dark blue or black complex. This reaction occurs because iodine molecules fit into the helical structure of the starch molecule, forming a starch-iodine complex. The presence of this complex is visually indicated by the color change.

Importance of Testing for Starch
Testing for the presence of starch in food is important for several reasons:
1. Starch is a vital nutrient and a major source of energy for our bodies. Knowing whether a food item contains starch helps in understanding its nutritional value.
2. Some individuals may have dietary restrictions or medical conditions that require them to limit their starch intake. Testing for starch can help them make informed food choices.
3. Starch is also used as a thickening agent in many food products. Knowing whether a particular food item contains starch can help in cooking and food preparation.

Conclusion
Iodine solution is commonly used to test for the presence of starch in food. This simple test can provide valuable information about the nutritional content and suitability of certain food items.