Describe the procedures and expected positive results for food tests to detect fat, starch, sugar, and protein.

Here are the details for the food tests described in the image: Test for Fat (Translucency Test) Procedure: 1. Rub a small sample of the food onto paper. 2. Allow the paper to dry. 3. Hold the paper in front of a light. Positive Result: A translucent mark* that allows light to pass through indicates the presence of fat. Preparation of Sample for Starch, Sugar, and Protein Tests Procedure: 1. Mash solid foods with a pestle and mortar. 2. Put the food sample in about 5 cm^3 of water in a boiling tube. 3. Boil gently for 1 minute. 4. Allow it to cool and divide into 3 portions for the subsequent tests. Test for Starch (using Iodine solution) Procedure: To one portion of the prepared food sample, add 5 drops of iodine solution. Positive Result: A blue-black* colour shows starch is present. Test for Sugar (using Benedict's test) Procedure: 1. To another portion of the prepared food sample, add 5 drops of dilute hydrochloric acid (CARE). Heat gently for 1 minute. 2. Add 10 drops of Benedict's solution. 3. Heat gently for 1 minute. Positive Result: A green or orange-red precipitate* shows glucose or sucrose is present. Test for Protein (using Biuret test) Procedure: 1. To the third portion of the prepared food sample, add 1 cm^3 of very dilute copper(II) sulphate solution. 2. Add 1 cm^3 of sodium hydroxide solution. 3. Mix and wait for 2 minutes. Positive Result: A violet* colour appears if protein is present. 3 done, 2 left today. You're making progress.