Ch. 39.2—Plant Responses to Internal & External Signals Flashcards
Plant hormones help coordinate (3):
- growth
- development
- responses to stimuli
The major plant hormones include (8):
- Auxin
- Cytokinins
- Gibberellins
- Abscisic acid
- Ethylene
- Brassinosteroids
- Jasmonates
- Strigolactones
_______: stimulates cell elongation; regulates branching and organ bending.
-Auxin.
________: stimulate plant cell division; promote later bud growth; slow organ death.
-Cytokinins.
__________: Promote stem elongation; help seeds break
dormancy and use stored reserves.
-Gibberellins.
_________: Promotes stomatal closure in response to drought;
promotes seed dormancy.
-Abscisic Acid.
_______: Mediates fruit ripening and the triple response.
-Ethylene.
_________: Chemically similar to the sex hormones of animals;
induce cell elongation and division.
-Brassinosteroids.
___________: Mediate plant defenses against insect herbivores;
regulate a wide range of physiological processes
-Jasmonates.
________: Regulate apical dominance, seed germination,
and mycorrhizal associations.
-Strigolactones.
Any response resulting in curvature of organs
toward or away from a stimulus is called:
- a tropism
The ___________ consists of a slowing of stem elongation, a thickening of the stem, and horizontal growth
-Triple Response.
_________: is the programmed death of cells or organs
-Senescence.
_________: also regulate many other physiological
processes, including—
Nectar secretion Fruit ripening Pollen production Flowering time Seed germination Root growth Tuber formation Mycorrhizal symbiosis Tendril coiling
-Jasmonates.
___________: are xylem-mobile chemicals that—
Stimulate seed germination
Suppress adventitious root formation
Help establish mycorrhizal associations
Help control apical dominance
-Strigolactones.
