Food tests GCSE Biology

What color does the solution turn if starch is present in the Iodine test?

• Purple

• Blue-black

• Yellow-brown

• Green

Which reagent is used in the test for reducing sugars?

• Ethanol

• Biuret solution

• Iodine solution

• Benedict’s solution

What is the purpose of the Biuret test?

• To test for proteins

• To test for reducing sugars

• To test for starch

• To test for lipids

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

• Yellow solution

• Brick-red precipitate

• Blue solution

• Green solution

What is the first step in the lipid test (Emulsion test)?

• Add ethanol and shake

• Add Benedict’s solution

• Add iodine solution

• Add Biuret solution

What safety equipment should be worn during the food test practical?

• Apron and face shield

• Helmet and boots

• Gloves and mask

• Safety goggles and lab coat

What happens if no protein is present in the Biuret test?

• Solution becomes cloudy

• Solution remains blue

• Solution remains purple/lilac

• Solution remains green

Which test requires the use of a water bath at 80°C?

• Iodine test

• Benedict’s test

• Biuret test

• Emulsion test

What is the result if lipids are present in the Emulsion test?

• Cloudy white emulsion forms

• Solution remains clear

• Solution turns blue

• Solution turns yellow

What is the color change observed in the Benedict’s test for a low concentration of reducing sugars?

• Blue to green

• Blue to yellow

• Blue to red

• Blue to purple