Questions and Answers
Which of the following is NOT an example of a plant growth regulator?
Nitrogen
What are the triggering substances recognized as plant growth regulators?
Auxins, Cytokinins, Gibberellins, and Phenolics
Which group of compounds contain nitrogen among the plant growth regulators?
Auxin and Cytokinin
How do environmental factors interact with phytohormones during plant growth?
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What are plant growth regulators known as when they modify physiological processes in plants?
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Which of the following statements about Abscisic Acid is TRUE?
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What are growth regulators in plants primarily responsible for?
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How do hormones in plants produce a characteristic physiological response?
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What effect does auxin have on cell division?
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In what process does auxin play a role in plant propagation?
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What is the primary role of auxin in vascular tissue differentiation?
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How does auxin contribute to cambium growth in woody plants?
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What is the effect of applying a large quantity of auxin to already growing roots?
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How does auxin contribute to fruit growth in plants?
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What is the primary purpose of maleic hydrazide, a common growth regulator?
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How do hormones primarily affect plant cells and metabolism?
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Which of the following is composed of nitrogen among the recognized plant growth regulators?
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What is the primary role of bio-stimulants or bioinhibitors, known as Plant Growth Regulators (PGR), in agriculture?
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What are the triggering substances recognized as plant growth regulators?
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How do environmental factors interact with phytohormones during plant growth?
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Which of the following is NOT composed of nitrogen among the recognized plant growth regulators?
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In what process do Auxin and cytokinin play a role according to the text?
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Which of the following statements about gibberellins is FALSE?
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What is the primary role of cytokinin in plant growth?
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How does abscisic acid primarily affect plant physiology?
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What effect does ethylene have on plant growth?
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What is the primary function of auxin in vascular tissue differentiation?
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Which statement about plant hormones is TRUE?
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Which of the following is NOT a physiological effect of auxin in plants?
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How do plant hormones primarily cause a variety of effects in plants?
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What does auxin promote in woody plants?
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Which statement about plant growth regulators is TRUE?
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Study Notes
Plant Growth Regulators
- Plant growth regulators are substances that modify physiological processes in plants.
Types of Plant Growth Regulators
- Plant growth regulators can be classified into five main categories: auxins, gibberellins, cytokinins, ethylene, and abscisic acid.
- Auxins are involved in cell elongation, cell division, and differentiation.
- Gibberellins are involved in stem elongation and seed germination.
- Cytokinins are involved in cell division and shoot formation.
- Ethylene is involved in fruit ripening and senescence.
- Abscisic acid is involved in seed dormancy and stress responses.
Characteristics of Plant Growth Regulators
- Plant growth regulators can be composed of nitrogen.
- Maleic hydrazide is a common growth regulator used to promote fruit growth.
Role of Plant Growth Regulators in Plant Growth
- Plant growth regulators play a crucial role in plant development, growth, and response to environmental stimuli.
- Plant growth regulators interact with environmental factors to regulate plant growth.
Functions of Specific Plant Growth Regulators
- Auxin promotes cell division, cell elongation, and differentiation in plants.
- Auxin plays a role in plant propagation, vascular tissue differentiation, and cambium growth in woody plants.
- Auxin can stimulate root growth when applied in small quantities.
- High concentrations of auxin can inhibit root growth.
- Cytokinin promotes cell division and shoot formation in plants.
- Gibberellins promote stem elongation and seed germination in plants.
- Ethylene promotes fruit ripening and senescence in plants.
- Abscisic acid promotes seed dormancy and stress responses in plants.
Importance of Plant Growth Regulators in Agriculture
- Plant growth regulators are used in agriculture to modify physiological processes in plants, promoting optimal growth and yield.
- Bio-stimulants or bioinhibitors, known as Plant Growth Regulators (PGR), are used to improve agricultural productivity.
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