GCSE Biology - Food Tests Practicals #16

The video tutorial covers essential food tests for GCSE Biology, including Benedict's test for sugars, iodine test for starch, Biuret test for proteins, and Sudan 3 test for lipids. It also includes the emulsion test for lipids for Edexcel students. The tutorial explains how to prepare food samples and conduct each test, detailing the expected results and safety precautions.

Which of the following tests is used to detect the presence of proteins in a food sample?

• Benedict's test

• Iodine test

• Burette test

• Sudan 3 test

What is the initial color of the solution when iodine is added to a food sample?

• Pink

• Blue

• Browny orange

• Green

In the Benedict's test, what color indicates a high concentration of reducing sugars?

• Yellow

• Brick red

• Green

• Blue

What is the purpose of adding ethanol in the emulsion test for lipids?

• To dissolve lipids

• To change the color of starch

• To stain lipids

• To dissolve proteins

What indicates the presence of lipids in the Sudan 3 test?

• A blue-black color

• A cloudy white color

• A bright red layer

• A pink or purple color