Water's ability to dissolve a wide range of substances stems from its dipolar nature, which means that it has a partial positive charge on one end (hydrogens) and a partial negative charge on the other (oxygen). This polarity allows water molecules to effectively interact with and surround various ions and polar molecules, stabilizing them in solution. As a result, water acts as a universal solvent, facilitating essential biochemical processes and reactions in living organisms, a concept crucial for understanding both environmental science and biological systems in the UPSC syllabus.