Biology · Plant Physiology
During water stress, abscisic acid (ABA) increases dramatically in leaves causing stomatal closure. The various events involved in this process are listed below: A. Opening of plasma membrane Ca2+-permeable ion channels and elevation of cytosolic Ca2+. B. Activation of plasma membrane anion channels, efflux of anions and potassium ions. C. Binding of ABA to cytosolic ABA receptor and inhibition of the activity of Type 2C protein phosphatases (PP2Cs). D. Phosphorylation and activation of NADPH oxidases (RBOH) and formation of apoplastic ROS. Which one of the following options represents the correct sequence of these events?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1C, D, A, B✓
- 2C, D, B, A
- 3A, C, D, B
- 4A, B, C, D
Correct answer
C, D, A, B
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