A few drops of Fehlings was added to Juice extract from fresh maize grain and...

Explanation

In this question, we are given information about a test carried out on juice extract from fresh maize grain. Fehling's solution was added to the extract and boiled. A red precipitate was formed during the test, which indicates the presence of a particular substance in the extract. We are then given five options to choose from, which are alcohol, protein, non-reducing sugar, starch, and reducing sugar. The correct answer in this case is reducing sugar, which means that the extract contained a type of sugar that can be oxidized by Fehling's solution. Reducing sugars are those that can donate electrons to another chemical, such as Fehling's solution, in a chemical reaction. This causes a change in the color of the solution and the formation of a precipitate, which can be used to detect the presence of reducing sugars in a sample. It is important for students to understand the difference between reducing and non-reducing sugars, as well as the properties and functions of different types of sugars in biology. This knowledge can be useful in many areas, such as food science, biochemistry, and genetics. To learn more about this topic, students can refer to their recommended textbooks or online resources that provide more detailed explanations and examples of sugar tests and their applications.