Plant hormones

What is auxin's primary function in plants?

Auxin promotes cell elongation, root initiation, and phototropism (growth toward light).

where is auxin produced?

In the shoot tips and young leaves.

What is gibberellin's main role in plants?

It stimulates stem elongation, seed germination, and flowering.

How do gibberellins help seeds germinate?

They break seed dormancy by promoting enzyme production that mobilizes stored food.

What is abscisic acid (ABA) known for?

ABA inhibits growth, promotes seed dormancy, and closes stomata during water stress.

What do cytokinins do in plants?

Promote cell division, delay leaf aging, and work with auxins to control organ development.

Where are cytokinins mostly produced?

In root tips.

What is the role of ethylene in plants?

It regulates fruit ripening, leaf abscission (falling), and responses to mechanical stress.

What makes ethylene unique among plant hormones?

It is a gas, unlike other plant hormones which are usually liquids or solids.