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Questions and Answers
What is the primary function of auxins in plants?
What is the primary function of auxins in plants?
In which of the following applications are auxins NOT typically used?
In which of the following applications are auxins NOT typically used?
What effect does the removal of the apical bud have on lateral buds?
What effect does the removal of the apical bud have on lateral buds?
Which of the following auxins is a synthetic compound?
Which of the following auxins is a synthetic compound?
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Apical dominance primarily affects which part of the plant?
Apical dominance primarily affects which part of the plant?
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Which statement correctly describes the role of auxins in plant growth?
Which statement correctly describes the role of auxins in plant growth?
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What is the primary source of auxins in higher plants?
What is the primary source of auxins in higher plants?
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Which of the following characteristics is NOT associated with auxins?
Which of the following characteristics is NOT associated with auxins?
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How does the removal of the apical bud affect the lateral buds?
How does the removal of the apical bud affect the lateral buds?
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Which auxin is representative of a synthetic compound used in horticulture?
Which auxin is representative of a synthetic compound used in horticulture?
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In what way do auxins contribute to preventing premature fruit drop?
In what way do auxins contribute to preventing premature fruit drop?
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What phenomenon describes the inhibition of lateral bud growth by the apical bud?
What phenomenon describes the inhibition of lateral bud growth by the apical bud?
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Which of the following is a common application of auxins in agriculture?
Which of the following is a common application of auxins in agriculture?
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Study Notes
Plant Growth Regulators - Auxins
- Auxins are plant hormones, derived from the Greek word "auxein" meaning "to grow".
- Indole-3-acetic acid (IAA) is a naturally occurring auxin, used in plant growth regulation.
- Other natural and synthetic compounds are also classified as auxins.
- Auxins are primarily produced in stem and root tips.
- They migrate to other areas of the plant to exert their effects.
- Indole butyric acid (IBA) is an example of a naturally occurring auxin.
- Synthetic auxins include naphthalene acetic acid (NAA) and 2,4-D (2,4-dichlorophenoxyacetic acid).
- Auxins are widely used in agriculture and horticulture.
- They are used to initiate root development in stem cuttings.
- Applications include promoting flowering in pineapples.
- Preventing premature fruit and leaf drop.
- Promoting the abscission (falling off) of older leaves and fruits.
Plant Growth Regulators - Apical Dominance
- Apical dominance is a phenomenon where the main stem/bud inhibits the growth of side buds/branches.
- Removal of the apical bud (decapitation) can lead to the growth of lateral/side buds.
- This process is frequently used in horticulture (e.g., tea plantations, hedge-making).
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Description
Explore the fascinating world of plant growth regulators, focusing on auxins and apical dominance. Learn how these hormones influence plant growth, root development, and their applications in agriculture and horticulture. This quiz covers the roles of natural and synthetic auxins like IAA and IBA.
