CAIE A-Level Biology A2 14.2.2 Daily Rhythms of Stomatal Opening and Closing Questions
Explain daily rhythms of stomatal opening and closing using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- Explain daily rhythms of stomatal opening and closing.
CAIE A-Level Biology A2 14.2.2 Daily Rhythms of Stomatal Opening and Closing Questions question 1
Guard cells are located in the epidermis of the leaves of most plants. When environmental conditions change, this causes changes in guard cells that control the opening and closing of stomata.
Stomata have daily rhythms of opening and closing.
Fig. 6.1 shows the percentage of stomata open at different times of the day, over a period of three days, in the thale cress plant, Arabidopsis thaliana.
Fig. 6.1
With reference to Fig. 6.1, describe the rhythm of stomatal opening and closing.
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