Podcast
Questions and Answers
If a plant exhibits stunted shoot growth despite optimal environmental conditions, a deficiency in which hormone is most likely the cause?
If a plant exhibits stunted shoot growth despite optimal environmental conditions, a deficiency in which hormone is most likely the cause?
- Abscisic Acid
- Ethylene
- Auxin (correct)
- Cytokinins
A plant is in a period of rapid fruit development. Which hormone is likely to be highly active?
A plant is in a period of rapid fruit development. Which hormone is likely to be highly active?
- Ethylene
- Auxin (correct)
- Abscisic Acid
- Cytokinin
A researcher wants to delay the senescence (aging) of leaves in a crop plant. Which hormone treatment would be most effective?
A researcher wants to delay the senescence (aging) of leaves in a crop plant. Which hormone treatment would be most effective?
- Decreasing Gibberellin Levels
- Applying Cytokinins (correct)
- Increasing Auxin Concentration
- Applying Abscisic Acid
A plant is not producing wood. Which area of the plant is likely lacking?
A plant is not producing wood. Which area of the plant is likely lacking?
A botanist discovers a mutant plant that exhibits excessive lateral bud growth. Which hormonal imbalance is the most probable cause?
A botanist discovers a mutant plant that exhibits excessive lateral bud growth. Which hormonal imbalance is the most probable cause?
A plant physiologist is studying hormone transport in a newly discovered species. What energy source is required for plant hormone transport?
A plant physiologist is studying hormone transport in a newly discovered species. What energy source is required for plant hormone transport?
A deciduous tree is preparing for winter. Which hormonal change is most likely occurring within its leaves?
A deciduous tree is preparing for winter. Which hormonal change is most likely occurring within its leaves?
You observe a plant with yellowing leaves that are prematurely falling off. Which hormone deficiency might be responsible?
You observe a plant with yellowing leaves that are prematurely falling off. Which hormone deficiency might be responsible?
Which plant tissue is primarily responsible for the long-distance transport of hormones throughout the plant?
Which plant tissue is primarily responsible for the long-distance transport of hormones throughout the plant?
If a plant's seeds are failing to germinate, which hormone treatment might be effective in promoting germination?
If a plant's seeds are failing to germinate, which hormone treatment might be effective in promoting germination?
In which season are growth-inhibiting hormones most active in plants adapted to temperate climates?
In which season are growth-inhibiting hormones most active in plants adapted to temperate climates?
Which of the following is NOT a location where auxin is produced in plants?
Which of the following is NOT a location where auxin is produced in plants?
What broad effect do Cytokinins and Auxin have on plant growth?
What broad effect do Cytokinins and Auxin have on plant growth?
Besides external enviornmental factors, what else do plant hormones interact with?
Besides external enviornmental factors, what else do plant hormones interact with?
What is true of Gibberellins?
What is true of Gibberellins?
In which season are growth-promoting hormones most active in plants?
In which season are growth-promoting hormones most active in plants?
What is the first hormone group that was described?
What is the first hormone group that was described?
Where are cytokinins NOT derived from?
Where are cytokinins NOT derived from?
Which of the following processes is NOT directly controlled by plant hormones?
Which of the following processes is NOT directly controlled by plant hormones?
What was the original source in which cytokinins were detected?
What was the original source in which cytokinins were detected?
Flashcards
What are plant hormones?
What are plant hormones?
Chemical messengers that regulate plant growth.
Where are plant hormones transported?
Where are plant hormones transported?
In the phloem tissue.
What is required for plant hormone transport?
What is required for plant hormone transport?
All plant hormones require an expenditure of energy (ATP) from the plant for transport.
How do hormones and growth interact?
How do hormones and growth interact?
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Two categories of hormones?
Two categories of hormones?
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When inhibiting hormones active?
When inhibiting hormones active?
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When are growth promoting hormones active?
When are growth promoting hormones active?
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What do hormones control in plants?
What do hormones control in plants?
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What is auxin?
What is auxin?
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Where is auxin made?
Where is auxin made?
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What are effects of auxin?
What are effects of auxin?
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What are cytokinins?
What are cytokinins?
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Where are cytokinins produced?
Where are cytokinins produced?
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What are the effects of cytokinins?
What are the effects of cytokinins?
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What are gibberellins?
What are gibberellins?
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Study Notes
- Plant hormones are chemical messengers regulating plant growth.
- Most plant hormones are transported in the phloem tissue.
- Transport of plant hormones requires energy expenditure (ATP) by the plant.
- Plant hormones interact with external environmental factors to influence growth.
- The two broad categories of plant hormones are growth inhibiting and growth promoting.
- Growth inhibiting hormones are mostly active in fall and winter.
- Growth promoting hormones are mostly active in spring and summer.
- Hormones control growth, seed germination, flowering, fruiting, shedding of leaves, and color change of leaves in plants.
Auxin
- Auxin is a growth promoting hormone and the first group of plant hormones described.
- Auxin is produced in shoot tips, seeds, fruits, leaves, and stems, but not roots.
- Auxin promotes cell elongation, shoot elongation, wood production, and fruit development.
- Auxin inhibits lateral bud development, and abscission of leaves, flowers, and fruits.
Cytokinins
- Cytokinins are growth promoting hormones originally detected in coconut milk.
- Cytokinins are produced in seeds, fruits, and roots.
- Cytokinins promote cell division and lateral bud development.
- Cytokinins inhibit leaf senescence.
Gibberellins
- Gibberellins are gibberellic acids with many types, more than any other group.
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