Auxins, gibberellins and cytokinins — practice questions
4 questions in the bank on this idea. Below are 4 of them, exactly as they appear in a test.
Which plant growth regulator is especially associated with apical dominance?
- A. Auxin
- B. Cytokinin
- C. Abscisic acid
- D. Ethylene
Why can pruning the shoot tip promote branching in many plants?
- A. It eliminates all cytokinin activity
- B. Reduced auxin inhibition of buds
- C. It causes permanent seed dormancy
- D. It blocks all cell division
A dwarf plant shows rapid stem elongation after hormone treatment. Which regulator best explains the response?
- A. Ethylene
- B. Abscisic acid
- C. Gibberellin
- D. A dormancy signal
Cultured plant tissue forms many shoots when cytokinin influence is high relative to auxin. What does this show?
- A. Plant hormones act independently
- B. Auxin alone controls organ formation
- C. Cytokinin always suppresses shoots
- D. Hormone balance directs development
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