Plant Hormones Questions And Answers Pdf

plant hormones questions and answers pdf

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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.

Plant hormones play a crucial role in controlling the way in which plants grow and develop.

Plant Hormones

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GK Questions and Answers Plant Hormones

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. For the most part, each group contains both naturally occurring hormones and synthetic substances. Auxin is the active ingredient in most rooting compounds in which cuttings are dipped during vegetative propagation.


This set of Life Sciences Multiple Choice Questions & Answers (MCQs) focuses on “Plant Hormones”. 1. Growth regulators, which control plant growth and.


GRE Subject Test: Biology : Understanding Plant Hormones

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5.4 Plant Hormones

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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!

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 effects that some melatonin treatments have on endogenous plant hormone levels, their related genes biosynthesis, catabolism, receptors and transcription factors and the physiological actions induced by melatonin, mainly in stress conditions, are discussed. Melatonin is an important modulator of gene expression related to plant hormones, e. Most of the studies performed have dealt with the auxin-like activity of melatonin which, in a similar way to IAA, is able to induce growth in shoots and roots and stimulate root generation, giving rise to new lateral and adventitious roots.

Understanding Plant Hormones

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