Food tests Biology

Question 1

what is the method to test for starch?

Answer 1

Prepare 5 cm3 of food sample in test tube and add a few drops of iodine solution to food sample, if colour changes from orange to blue-black starch is present.

Question 2

what is the method to test for sugar?

Answer 2

prepare 5 cm3 of food sample in test tube and add 10 drops of benedict’s solution using pippet, then place test tube in a water bath at 75 degrees C for 5 minutes, if solution turns from blue to brick-red sugar is present.

Question 3

what is the method to test for protein?

Answer 3

prepare 2cm3 of food sample into test tube and add 2cm3 of biuret solution into test tube and gently shake. If solution turns from blue to pink-purple protein is present.

Question 4

what is the method to test for fats?

Answer 4

Add ethanol to food sample and mix with distilled water and gently shake, if solution turns milky white emulsion forms so fats is present