Course review
Review each learning objective in this topic, then open its concept explanation or question set.
Learning objective
• First cells originated in water, where oceans shielded early life from UV radiation • Water remains the medium for most life processes and forms much of cell mass
Start with the concept explanation, then practise to create mastery evidence.
Learning objective
• O-H covalent bonds and water's V-shape make molecules polar • Hydrogen bonds form between water molecules, not within a molecule • Hydrogen bonding explains many unusual water properties
Start with the concept explanation, then practise to create mastery evidence.
Learning objective
• Hydrogen bonding creates cohesion and surface tension • Cohesion prevents xylem water columns breaking under tension • Surface tension supports droplets and surface-skating insects
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Learning objective
• Water adheres to polar or charged surfaces • Adhesion supports capillary action in soil channels and cellulose cell walls • Cohesion is the stronger force in xylem transport; adhesion helps refill vessels
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Learning objective
• Water dissolves ions and polar molecules by hydration and hydrogen bonding • Aqueous solution enables diffusion, transport, enzyme activity, and metabolism • Non-polar molecules are hydrophobic; O₂ and N₂ have low solubility in water
Start with the concept explanation, then practise to create mastery evidence.
Learning objective
• Specific heat capacity stabilizes aquatic temperatures and body temperature • Thermal conductivity, buoyancy, and viscosity shape aquatic adaptations • Compare black-throated loon and ringed seal adaptations for diving, insulation, and movement
Start with the concept explanation, then practise to create mastery evidence.