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CAIE A-Level Biology 12.2.12 Rice Adaptations to Flooding

Practise linking rice aerenchyma to oxygen diffusion, ethanol fermentation to NAD regeneration and rapid stem elongation to reaching air and light above floodwater.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • describe aerenchyma as extensive connected air spaces that lower resistance to oxygen diffusion
  • explain ethanol fermentation as regenerating NAD without toxic lactate accumulation
  • link rapid stem elongation with leaves reaching air and light above floodwater

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