Proton pumps in guard cell membranes

  1. make ABA
  2. pump water in
  3. pump H⁺ out, leading to K⁺ entry
  4. pump K⁺ out
Answer

C) pump H⁺ out, leading to K⁺ entry

The membrane becomes hyperpolarised. AS & A Level Biology · Topic 14 Homeostasis · 14.2 Homeostasis in plants

Biology MCQ · More A Level Biology: Homeostasis MCQs · Practise