IB DP Biology Topic 2: Molecular biology 2.2 Water Question Bank SL Paper 1

Ans: C

Cohesion is the attraction of water molecules to other water molecules due to hydrogen bonding. Each water molecule can form four hydrogen bonds with neighbor molecules. The strong Coulomb attraction between the molecules draws them together or makes them “sticky”. Cohesion is important in plants because it helps them take up water at their roots. Cohesion also contributes to water’s high boiling point, which helps animals regulate body temperature.