Why use water has a test material for reducing sugars starch and protein?

Water is commonly used as a test medium for reducing sugars, starch, and proteins because it is a universal solvent that can dissolve many substances, allowing for easy mixing and reaction. Additionally, water is inert and does not interfere with the chemical reactions being tested, ensuring accurate results. Its use facilitates the preparation of solutions and dilutions necessary for various biochemical assays. Lastly, water is readily available and cost-effective, making it ideal for laboratory experiments.