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20 Cards in this Set
- Front
- Back
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What do hormones do for plants?
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Plants use hormones to execute the proper response to internal and external factors (stimuli).
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What factors do hormones affect in plants?
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development
growth repair reproduction response to environmental conditions including natural enemies |
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Why must hormones be transported among all cells and organs?
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Hormones must be transported among all cells and organs to enable efficient communication and coordination of activities.
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How do hormones move from cell to cell?
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Hormones move among adjacent plant cells through plasmodesmata.
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What are cytokinins?
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Cytokinins regulate cell division.
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What are auxins?
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Auxins regulate cell elongation.
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What are gibberellins?
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Gibberellins regulate cell division and elongation.
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What is released with injury?
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Injury causes Ethylene to be released, which stimulates--
cytokinin release to induce cell division auxin release to induce cell elongation |
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What is the role of abscisic acid (ABA)?
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Abscisic acid maintains seed dormancy until favorable conditions are detected.
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What is the role of gibberillic acid?
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Gibberillic acid coordinates the metabolic reactions that support seed germination.
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What is released once seeds have matured?
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When the seeds reach maturity, Ethylene is released in order to coordinate the transition from unripe to ripe fruit tissue in some plant species.
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What is the response to water stress?
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Absicisic acid (ABA) coordinates the response to water stress.
stomata closure root growth |
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What increases fruit size in Thompson seedless grapes?
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gibberellic acid
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What induces the programmed death (apoptosis or senescence) of cells and organs?
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Ethylene
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What prevents the programmed death (apoptosis or senscence) of cells and organs?
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cytokinin
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What stimulates parthenocopy in some species to produce seedless fruits?
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auxin
gibberellic acid |
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What delays fruit drop in apple and citrus drops?
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auxin
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How do plants use hormones to coordinate growth?
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Growth is due to cell division and elongation.
Cytokinins regulate cell division. Auxins regulate cell elongation. Gibberellins regulate cell division and elongation. |
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What does fertilization cause the release of?
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Fertilization causes the release of auxin and gibberellic acid in order to coordinate the development of the ovary into fruit tissue.
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What hormones coordinate the response to injury by herbivores and pathogens?
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systemin (protein)
salicylic acid jasmonic acid oligosaccharins |
