Plant Hormones Questions And Answers PdfBy Jacqueline O. In and pdf 17.01.2021 at 11:23 8 min read
File Name: plant hormones questions and answers .zip
Plant hormones play a crucial role in controlling the way in which plants grow and develop.
- 5.4 Plant Hormones
- Easy Biology Class
- How hormones and growth regulators affect your plants
- Objective for Grower& Plant Hormones
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5.4 Plant Hormones
Indoleacetic acid IAA is the most abundant hormone in plants. The correct answer is auxin. IAA is the most abundant auxin naturally found in plants, and plays key roles in plant development and growth. Perishable fruit is often picked before it is ripe. This hard, unripe fruit is easier to transport as it is less likely to bruise or spoil while in transit. Ethylene gas promotes fruit ripening; in a classic example of a positive feedback loop, ripe fruit causes the production of more ethylene gas, which promotes more fruit ripening this is the origin of the phrase "one bad apple spoils the bunch!
Cytokinins stimulate cell division and cytokinesis, and they can delay senescence deterioration due to age, as in the case of cells. Gibberellins promote cell growth, and also promote stem and leaf elongation. Abscisic acid ABA promotes seed dormancy, inhibits plant growth, and closes plant stomata during water shortages. They enhance apical dominance, which promotes plants' upward growth, as opposed to lateral growth.
Auxins play a number of crucial roles in plant growth, behavior, and development. They were the first major class of plant hormone to be discovered and are present in all parts of a plant in varying concentrations. Some of their more notable functions include causing phototropism, enhancing apical dominance, and softening the cell wall to stimulate cell elongation and growth.
Indoleacetic acid IAA is a naturally occurring auxin, though some synthetic auxins are used as weed killers. Ethylene gas is a plant hormone that promotes fruit ripening in a positive feedback loop. Ripe fruit produces more ethylene gas, which promotes more fruit ripening, and so on. It is not a kind of auxin. If you've found an issue with this question, please let us know. With the help of the community we can continue to improve our educational resources.
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Hanley Rd, Suite St. Louis, MO Subject optional. Home Embed. Email address: Your name:. Example Question 1 : Understanding Plant Hormones. Possible Answers: Auxin. Correct answer: Auxin. Explanation : The correct answer is auxin. Report an Error. Correct answer: Ethylene. Explanation : Ethylene gas promotes fruit ripening; in a classic example of a positive feedback loop, ripe fruit causes the production of more ethylene gas, which promotes more fruit ripening this is the origin of the phrase "one bad apple spoils the bunch!
Example Question 1 : Plant Reproduction. Possible Answers: They promote fruit ripening, which triggers the production of more auxins. They are responsible for phototropism—plants' tendency to grow toward light sources. Correct answer: They promote fruit ripening, which triggers the production of more auxins. Explanation : Auxins play a number of crucial roles in plant growth, behavior, and development. Copyright Notice. View Tutors. Andrew Certified Tutor.
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Easy Biology Class
Plant hormones and growth regulators are chemicals that affect:. These growth-regulating substances most often are applied as a spray to foliage or as a liquid drench to the soil around a plant's base. Applied concentrations of these substances usually are measured in parts per million ppm and in some cases parts per billion ppb. Generally, their effects are short-lived, and they may need to be reapplied in order to achieve the desired effect. There are five groups of plant-growth-regulating compounds: auxin, gibberellin GA , cytokinin, ethylene, and abscisic acid ABA.
Hormones get things done. Think of them as chemical messengers that are made in one place in the body and deliver their message in a totally different place in the body. And just like hot sauce, a little goes a long way. Hormones are usually found in very small concentrations, but boy to they pack a punch! We know hormones cause a lot of changes in humans ah, puberty , but did you know that plants have hormones, too? Plants miss out on all the fun of body hair, acne, and voice changes, but read on to learn about the amazing effects that hormones have on plant growth and development! These hormones can work together or independently to influence plant growth.
How hormones and growth regulators affect your plants
Plant melatonin appears to be a multi-regulatory molecule, similar to those observed in animals, with many specific functions in plant physiology. In recent years, the number of studies on melatonin in plants has increased significantly. One of the most studied actions of melatonin in plants is its effect on biotic and abiotic stress, such as that produced by drought, extreme temperatures, salinity, chemical pollution and UV radiation, among others. This review looks at studies in which some aspects of the relationship between melatonin and the plant hormones auxin, cytokinin, gibberellins, abscisic acid, ethylene, jasmonic acid and salicylic acid are presented.
The Study Questions below are intended as a study tool. Write short answers to them using your lecture notes and textbook as references. After you have worked on them alone for awhile, I strongly recommend that you meet with other students in a study group to discuss the Study Questions and your answers. You may also raise these Study Questions in lecture and during my office hours. Exam questions will be based on the correct and complete answers to the Study Questions.
Plant Hormones are also known as plant growth substances, plant growth regulators or phytohormones. Therefore, other factors like nutrients, environmental conditions etc. Auxins, cytokinin and gibberellins largely affect the plant growth.
Indoleacetic acid IAA is the most abundant hormone in plants. The correct answer is auxin.
Objective for Grower& Plant Hormones
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