The presence of sugar in onion leaves can be tested with

Options

A. iodine
B. copper sulphate solution
C. lime water
D. benedict's solution

Answer

To test for the presence of sugar in onion leaves, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reagent**: The first step is to identify the appropriate reagent for testing sugar. In this case, we will use Benedict's solution, which is specifically designed to test for reducing sugars.

2. **Prepare the Sample**: Take a small piece of onion leaf and chop it finely to increase the surface area. This will help in extracting the sugars present in the leaf.

3. **Extract the Juice**: Place the chopped onion leaves in a test tube and add a small amount of water. Heat the mixture gently to extract the juice from the leaves.

4. **Add Benedict's Solution**: After extracting the juice, allow it to cool if necessary. Then, add a few drops of Benedict's solution to the test tube containing the onion leaf extract.

5. **Heat the Mixture**: Place the test tube in a boiling water bath for about 5-10 minutes. This heating process will allow the reaction between the sugar and the Benedict's solution to occur.

6. **Observe the Color Change**: After heating, observe the color of the solution in the test tube. If sugar is present, the solution will change from blue (the original color of Benedict's solution) to green, yellow, or red, depending on the amount of sugar present. A red color indicates a high concentration of sugar.

7. **Conclusion**: If a color change is observed, it confirms the presence of sugar in the onion leaves.