RP: Food Tests

What is the significance of food tests in relation to photosynthesis?

• They determine the health of plants.

• They are used to measure water content in plants.

• They help identify the presence of starch, a product of photosynthesis.

• They are used to test soil quality.

Why is it recommended to start with biscuit when testing food samples?

• Because it has more chemicals to test.

• Because it takes less time to prepare.

• Because it is usually more readily available.

• Because it is less messy compared to others.

What is the purpose of grinding food samples in the preparation phase?

• To preserve the food for longer testing periods.

• To change the taste of the food.

• To make it easier to dissolve the food chemicals in water.

• To mix different food samples together.

Why is it important to clean the pestle and mortar between grinding different food samples?

• To prevent chemical reactions between different foods.

• To avoid contamination and ensure accurate test results.

• To speed up the testing process.

• To prevent damage to the pestle and mortar.

What does a color change in the Benedict's test indicate?

• Presence of lipids.

• Presence of proteins.

• Presence of water.

• Presence of glucose.

What is the initial color of the iodine solution used in the starch test?

• Red

• Orange

• Green

• Blue

How is the lipid test conducted using ethanol?

• By vigorously shaking the mixture of food sample and ethanol.

• By freezing the mixture of food sample and ethanol.

• By boiling the food sample with ethanol.

• By letting the mixture sit undisturbed.

What indicates a positive result for proteins in the Biuret test?

• The solution turns from blue to green.

• The solution turns from blue to pink or purple.

• The solution remains blue.

• The solution turns from blue to red.

What unexpected result might occur when testing grated cheese for starch?

• The test may show a false negative due to high fat content.

• The test may show a false positive due to the presence of proteins.

• The test may be inconclusive due to the texture of the cheese.

• The test may show a positive due to added starch as a food additive.

What does a milky white result in the ethanol test for lipids indicate?

• The presence of glucose.

• The presence of lipids.

• The presence of starch.

• The absence of lipids.