Food Tests

What is the first step in preparing a food solution for nutrient testing?

• Add iodine solution

• Crush the food using a pestle and mortar

• Add distilled water

• Use blue Benedict's solution.

To test for starch, which solution is used?

• Ethanol

• Blue Biuret reagent

• Iodine solution

• Benedict's solution

If a solution turns dark blue-black after adding iodine, what does it indicate?

• Presence of lipids

• Presence of protein

• Presence of starch

• Presence of sugar

To test for lipids, you would add a few drops of ______ to the food solution.

• Iodine solution

• Ethanol

• Blue Biuret reagent

• Benedict's solution

What indicates the presence of lipids in a food solution?

• Solution turns purple

• Solution turns cloudy

• Solution turns red

• Solution turns blue-black.

Which reagent is used to test for protein?

• Ethanol

• Iodine solution

• Blue Biuret reagent

• Benedict's solution

If a solution turns purple after adding blue Biuret reagent, what does it indicate?

• Presence of starch

• Presence of protein

• Presence of lipids

• Presence of sugar

To test for sugars, the food solution is warmed with ______ for 10 minutes.

• Iodine solution

• Ethanol

• Blue Biuret reagent

• Benedict's solution

What color change indicates the presence of sugar when using Benedict's solution?

• A) Blue to purple

• B) Green, yellow, orange, or red

• C) Cloudy

• D) Dark blue-black

What is the purpose of using a pestle and mortar in food tests?

• To heat the food

• To crush the food

• To add color

• To test for sugar