Plant Growth Regulators

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What are plant growth regulators?
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Plant growth regulators (PGRs) are chemicals that influence plant growth and development, including hormones produced naturally by the plant.
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What role do auxins play in plant growth?
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Auxins regulate cell elongation, phototropism, and gravitropism, and they stimulate root initiation.
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How do cytokinins affect plants?
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Cytokinins promote cell division and delay leaf senescence, influencing nutrient mobilization and chlorophyll synthesis.
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What is the function of gibberellins in plants?
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Gibberellins stimulate stem elongation, seed germination, and flowering.
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What effect does ethylene have on plants?
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Ethylene promotes fruit ripening and leaf senescence and regulates responses to stress.
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How do abscisic acid functions differ from other plant growth regulators?
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Abscisic acid primarily maintains seed dormancy and regulates stress responses, differing from other PGRs that often promote growth.
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What is phototropism, and which PGR is responsible for it?
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Phototropism is the growth of plants in response to light, primarily influenced by auxins.
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What is the significance of plant hormones in agriculture?
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Plant hormones are used to enhance crop yields, regulate growth rates, and improve fruit development and ripening timing.
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How are synthetic PGRs used in commercial agriculture?
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Synthetic PGRs are used to manipulate growth, for instance, to prevent premature fruit drop or to enhance flower set.
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What is the role of PGRs in seed germination?
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PGRs like gibberellins promote seed germination by breaking dormancy and stimulating enzyme production.
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Which PGR is primarily responsible for stimulating root growth?
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Auxins are primarily responsible for stimulating root growth.
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How is ethylene production influenced by stress factors?
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Stress factors like wounding and drought increase ethylene production, which helps in stress adaptation.
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What is the dual role of abscisic acid in plants?
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Abscisic acid helps induce and maintain seed dormancy and is crucial for the plant's response to drought stress.
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How do PGRs like cytokinins interact with cells?
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Cytokinins promote cell division and influence differentiation, working closely with auxins.
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What is the relationship between abscisic acid and seed dormancy?
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Abscisic acid induces seed dormancy by preventing germination during unfavorable conditions.
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