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A-Level Biology OCR A

System Roles Water Reactions List Plays Life Solvent

Water serves crucial roles in life as a solvent, reactant, transport medium, coolant, and insulator.

Water acts as a solvent, reactant, transport medium, coolant, and insulating layer in various biological processes.

Front List the roles that water plays in life (5).
Back Roles of water:
  • Solvent - most biological reactions happen in aqueous solution (cell cytoplasm is mainly water)
  • Reactant - hydrolysis, condensation
  • Transport medium - in blood, lymphatic system, excretory system, digestive system, vascular tissues, etc
  • Coolant - helps buffer temperature changes during chemical reactions in cells
  • Insulating layer - ice freezes and floats which insulates the water so seas do not freeze solid, providing aquatic organisms with a constant environment

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