GCSE Biology: Food Tests Quiz

How is food prepared for testing?

• By freezing and then thawing

• By heating to 100 degrees Celsius

• By breaking, dissolving, and filtering

• By adding vinegar

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

• Filtering it with filter paper

• Heating it in a water bath

• Breaking it up using a mortar and pestle

• Adding Benedict's solution

What is the main purpose of filtering the food sample?

• To add nutrients

• To increase its temperature

• To change its color

• To remove large particles

What is the purpose of the Benedict's test?

• To detect the presence of proteins

• To check for lipids

• To identify reducing sugars

• To test for starch

What result in the Benedict's test indicates a high concentration of reducing sugars?

• Turning brick red

• Turning yellow

• Turning green

• Staying blue

What does a change to green, yellow, or brick red in the Benedict's test indicate?

• Presence of lipids

• Absence of starch

• Presence of proteins

• Presence of reducing sugars

What indicates the presence of starch in the iodine test?

• A blue-black color

• A pink-purple color

• A green-yellow color

• A red layer

What does a blue-black color in the iodine test signify?

• The presence of reducing sugars

• The absence of starch

• The presence of lipids

• The presence of starch

What color change indicates proteins in the Biuret test?

• From blue to pink or purple

• From orange to blue-black

• From clear to cloudy white

• From blue to red

Which test involves adding potassium hydroxide followed by copper sulfate for the Edexcel course?

• Benedict's test

• Biuret test

• Emulsion test

• Sudan III test