Practice IB Biology Topic A1.1 Water with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for A1.1 Water and mirrors Paper 1A, 1B, 2 style where relevant.
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Vaporizing water required more energy per mole than methane. Which interactions were disrupted during vaporization?
In plant tissues, adhesion between water and cellulose supports water movement. What would be the likely consequence if plant cell walls were composed of hydrophobic material?
Surface tension arises from unbalanced hydrogen bonding at the air–water interface. What ecological consequence does this property have?
Water has a high specific heat capacity compared to air. How does this property affect the thermal environment for aquatic organisms?
Labelled solutes were tested before lipoprotein removal and after removal and re-addition. Which inference is supported?
| Solute | Untreated plasma / % dispersed | Lipoprotein-depleted plasma / % dispersed | Lipoproteins re-added / % dispersed |
|---|---|---|---|
| glucose | 98 | 97 | 98 |
| cholesterol | 94 | 8 | 92 |
Water: intermolecular hydrogen bonds; methane: intermolecular attractions
Water: intermolecular hydrogen bonds; methane: covalent C-H bonds
Water: covalent O-H bonds; methane: intermolecular attractions
Water: covalent O-H bonds; methane: covalent C-H bonds
Capillary action would be enhanced
Transpiration would increase significantly
Water would fail to climb the walls of xylem vessels
Cohesion between water molecules would be lost
