GCSE Biology: Food Tests Quiz

How is the food sample prepared before any tests are conducted?

• It is crushed, dissolved in water, and filtered

• It is heated directly

• It is frozen and then thawed

• It is dried and powdered

How is the food sample initially treated in the preparation stage?

• Crushed and mixed with distilled water

• Dried and ground

• Blended with ethanol

• Heated to 75 degrees Celsius

What is the purpose of the Benedict's test in food testing?

• To identify reducing sugars

• To check for lipids

• To find non-reducing sugars

• To detect the presence of proteins

What is the initial color of the solution in the Benedict's test before any color change?

• Green

• Blue

• Red

• Yellow

What is the temperature setting for the water bath in the Benedict's test?

• 25 degrees Celsius

• 75 degrees Celsius

• 50 degrees Celsius

• 100 degrees Celsius

What is the main purpose of using a test tube holder in the Benedict's test?

• To measure the solution

• To prevent contamination

• For safety to avoid direct heat

• To mix the chemicals

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

• Absence of any sugars

• Presence of reducing sugars

• Presence of lipids

• Presence of non-reducing sugars

What color change indicates the presence of starch in the iodine test?

• From green to red

• From brown-orange to blue-black

• From orange to black

• From blue to pink

Which substance is added to the food sample in the iodine test?

• Sudan III solution

• Benedict's solution

• Iodine solution

• Biuret solution

In the Biuret test, what indicates the presence of proteins?

• The solution turns cloudy white

• The solution turns red

• The solution remains blue

• The solution turns from blue to pink or purple