Why water is known as polar solvent

Q1. Why water is known as polar solvent? How is hydrogen bonding involved in cohesive attraction of water molecules? Water molecules also attract other sorts of molecules, particulary ions.Why is this?

Q2. A scientist produces an artificial membrane from phospholipids and notices that oxygen, but not glucose readily moves through membrane. What could account for the inability of glucose to move through artificial membrane?

Q3. Scientist is studying bacteria discovered on sea floor. In the nonexistence of light, these bacteria can use organic molecules (including human waste) to generate electricity. What mode of nutrition these bacteria probably use?

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