Which term describes 'water loving' molecules that dissolve readily in water?

• A. Hydrophilic
• B. Hydrophobic
• C. Biosphere
• D. Ecosystem

Answer: (A)

Water-loving molecules dissolve readily in water because water is a polar solvent and can form hydrogen bonds or ionic interactions with polar or charged groups. Molecules with these polar features are described as hydrophilic, meaning they have an affinity for water and tend to dissolve well. In contrast, hydrophobic refers to nonpolar substances that don't interact favorably with water and thus don't dissolve easily. Biosphere and ecosystem describe broad environmental concepts, not molecular properties, so they don’t apply to solubility. So the best term for water-loving, water-soluble molecules is hydrophilic.