CAIE A-Level Biology 14.2.4 Abscisic Acid & Stomatal Closure
Practise sequencing ABA signalling through calcium and potassium ion movement to guard-cell water loss and stomatal closure.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- sequence ABA receptor binding, Ca²⁺ signalling and K⁺ movement from guard cells
- link reduced guard-cell water potential and osmosis to loss of turgor and closure
- interpret the inverse relationship between ABA concentration and stomatal conductance
