In water stress, ABA is produced by

  1. flowers
  2. guard cells only
  3. xylem vessels
  4. roots and leaves
Answer

D) roots and leaves

ABA is a stress hormone. AS & A Level Biology · Topic 14 Homeostasis · 14.2 Homeostasis in plants

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