Answer:
See below
Explanation:
Q1. incomplete information given
Q2. Protein will be present so test tube C. Beef is a rich source of protein. Hence, the Biuret test will be relevant in this case since that is specific to detecting proteins.
Q3. Orange juice has ample amount of simple sugars (such as fructose, glucose), which are monosaccharides. So option A. Benedict test is required here.
Q4. Incomplete information provided
Q5. You need a certain kind of food that is rich in protein and simultaneously lacks fats. Here, skimmed milk is relevant - fat has been removed from the milk although protein is still present.