- A Adventitious root initiation exclusively, with no effect on shoot tissue
- B Stomatal closure via guard cell turgor loss under water stress
- C Stem elongation and seed germination
- D Climacteric fruit ripening through ethylene biosynthesis induction
Correct answer: C. Stem elongation and seed germination
Explanation: Gibberellins promote stem elongation (important in dwarf plants), seed germination, and flowering in some plants.
Concept context
Phases of plant growth, the five classical plant hormones plus newer ones, photoperiodism, vernalization, and seed dormancy.