Food Testing Quiz

What color change indicates the presence of sugar in Benedict's test?

• Red to blue

• Blue to red

• Yellow to blue

• Green to yellow

Which reagent is used to test for starch?

• Biuret solution

• Iodine solution

• Benedict's solution

• Ethanol

What color indicates a positive test for starch when using iodine solution?

• Blue-black

• Red

• Yellow

• Orange

What is the initial color of Benedict's solution before testing for sugars?

• Blue

• Red

• Green

• Yellow

What is the procedure to test for lipids in food?

• Add iodine solution to the food sample

• Add Benedict's solution and heat

• Rub the food on filter paper and look for a translucent spot

• Add Biuret solution and observe color change

What is a positive result in the test for protein using Biuret solution?

• Blue to orange

• Red to green

• Blue to purple

• Yellow to blue

When testing for lipids, what indicates a positive result?

• Formation of bubbles

• A blue-black color

• A translucent spot on filter paper

• A purple color change

Which nutrient is tested using Biuret solution?

• Starch

• Lipids

• Protein

• Sugars

In which test does heating play an important role to observe results?

• Lipid test

• Starch test

• Protein test

• Sugar test with Benedict's solution

What is the function of iodine in food testing?

• To test for sugars

• To test for starch

• To test for proteins

• To test for lipids