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CAIE A-Level Biology 14.2.2 Daily Rhythms of Stomatal Opening

Practise describing timed stomatal data and using persistence in darkness to infer endogenous rhythms or altered timing and amplitude to infer light entrainment.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • describe day–night opening patterns using comparative times and percentage data
  • infer endogenous genetic control when rhythmic change persists without light cues
  • infer environmental entrainment when darkness alters peak opening or cycle timing

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