plant hormone - Plant Hormones There has always been a talk...

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Plant Hormones There has always been a talk about hormones in science whether talking about a human or an animal. Just like humans and animals, plants are living things too, and they require some additives to grow faster, or to give the desired results, thus to cope up with that plant hormones are given to the plants. According to the website wikipedia.com “Plant hormones (also known as plant growth regulators (PGRs) and phytohormones) are chemicals that regulate plant growth. Plant hormones are signal molecules produced at specific locations in the plant, and occur in extremely low concentrations. The hormones cause altered processes in target cells locally and at other locations. Plants, unlike animals, lack glands that produce and secrete hormones. Plant hormones shape the plant, affecting seed growth, time of flowering, the sex of flowers, senescence of leaves and fruits. They affect which tissues grow upward and which grow downward, leaf formation and stem growth, fruit development and ripening, plant longevity and even plant death.” Wikipedia.com also states that” It is generally accepted that there are five major classes of plant hormones, some of which are made up of many different chemicals that can vary in structure from one plant to the next. The chemicals are each grouped together into one of these classes based on their structural similarities and on their effects on plant physiology.”Information about different plant hormones is listed below:
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According to the website http://www.plant-hormones.info” Abscisic acid is a single compound unlike the auxins, gibberellins, and cytokinins. It was called "abscisin II" originally because it was thought to play a major role in abscission of fruits. At about the same time another group was calling it "dormin" because they thought it had a major role
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This note was uploaded on 05/12/2008 for the course BIO 110 taught by Professor Mrs. during the Spring '08 term at Northern Virginia.

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plant hormone - Plant Hormones There has always been a talk...

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