Plant Hormones

Question 1

What is the purpose of Auxins?

Answer 1

Promote cell elongation, root initiation, apical dominance, and phototropism.

Example: Indole-3-acetic acid (IAA)

Question 2

What is the primary function of Cytokinins?

Answer 2

Stimulate cell division, delay leaf senescence, promote shoot formation (often antagonistic to auxin).

Question 3

What do Gibberellins (GAs) stimulate?

Answer 3

Stem elongation, seed germination, and breaking of dormancy.

Question 4

What is the role of Abscisic Acid (ABA)?

Answer 4

Promotes dormancy, stomatal closure, and stress response (especially drought).

Question 5

What does Ethylene control?

Answer 5

Fruit ripening, leaf abscission, and response to mechanical stress (e.g. wind or touch).