Plant Growth Regulators (Leaving Cert Biology): Flashcards
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What is a growth regulator?
What is a growth regulator?
A chemical that controls plant growth
Where are growth regulators produced?
Where are growth regulators produced?
Meristematic tissue
How are growth regulators transported?
How are growth regulators transported?
In phloem by diffusion
What is the function of growth promoters?
What is the function of growth promoters?
Increase the rate of growth
Examples of growth promoters
Examples of growth promoters
Auxins and gibberellins
What does IAA stand for?
What does IAA stand for?
Indole Acetic Acid
Effect of auxin on stem growth
Effect of auxin on stem growth
Causes stem elongation
What is apical dominance?
What is apical dominance?
Auxin inhibits side branches, allowing plant to grow tall
Effect of removing apical tip
Effect of removing apical tip
Side branches form, plant grows wider
How does IAA cause phototropism?
How does IAA cause phototropism?
Diffuses to shady side, causes elongation and bending towards light
What is the function of growth inhibitors?
What is the function of growth inhibitors?
Decrease growth rate or stop it completely
Examples of growth inhibitors
Examples of growth inhibitors
Ethene and abscisic acid
Function of ethene
Function of ethene
Causes fruits to ripen
Function of abscisic acid in dry conditions
Function of abscisic acid in dry conditions
Causes stomata to close to conserve water
What does rooting powder contain?
What does rooting powder contain?
NAA to stimulate root growth in cuttings