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level: Plant Growth Hormones, and Uses

Questions and Answers List

level questions: Plant Growth Hormones, and Uses

QuestionAnswer
What is Auxin? Where is it Made?-A plant Hormone -They control the Growth at the Tips of Shoots and Roots -Auxin is made in the Tips
What does the Auxin do in the Tips?-It will Diffuse backwards, to start up the Cell Elongation Process [Cells get Longer] -This process happens with the Cells behind the Tips
What does Auxin Promote and Inhibit?-Growth -In the Roots, Auxin Inhibits Growth -In the Shoot, Auxin Promotes Growth
Shoots are Positively Phototropic. What does this Mean?-When the Tip is being Beamed on by Light, Auxin starts to gather more so on the Shaded Side [Majority goes on Opposite Side] -The Cells there Grow [Elongate] Faster on that Side, which has the Shoot bend, toward the Light -The Positive part is saying that it Grows Towards the Source
Shoots are Negatively Gravitropic. What does this Mean?-When the shoot grows Sideways, the Gravity makes an the Distribution of Auxin uneven, with the Majority on the Lower/Bottom side -The Lower side grows Faster, and the Shoot bends Upwards. -The Negative part is saying it Grows Away the Source [Force]
Roots are Positively Gravitropic. What does this Mean?-Root that grows Sideways will have the Auxin unevenly Distributed, and the Majority will be at the Bottom Side -But the Extra Auxin cancels the Growth, so the Cells on the Top Side Elongate Faster, and the Root bends Downwards -Since its Following Gravity's Forces, its Growing With it [Positive]
Roots are Negatively Phototropic. What does this Mean?-If the Root gets Beamed on with Light, the Majority of the Auxin will go to the Shaded Side -Again, the Extra Auxin cancels the Growth, so the Cells that has the Sunshine on Elongate, and therefore the Root grows Downwards -Since its growing Away from Light, its Negative
Explain a Practical that can Prove of the Positive Phototropic-Put 10 cress seeds, in 3 different Petri dishes, that is Lined with Most Filter Paper -Shine a Light Directly on one, and Different Directions on the Other two -Wait a Week, and then you will see that the Cress Seeds are growing Towards the Light [Other variables: Temperature, distance from Lamp and Type of Seeds should be the Same]
What is Gibberellin?-Plant Hormone -This starts Seed Germination, [Seed grows to a Plant], Stem Growth and Flowering
How can Gibberellin start the Stem? Can it work with Auxin?-It can because of Stem Elongation. [Like with Cell Elongation] -Working with auxin can create Huge effects on the Plant Growth
How is Ethene made, and what does it do?-Ethene is found in Aging leaves -It makes the Cells that connect the Leaf to the Plant to Expand, making the Cell break the Cell Walls, therefore breaking the Connection -Ethene can also make Enzymes, that can make Fruit to Ripen
How can Auxin be involved in Leaves?-Auxin is also made by Young Leaves -Auxin also stops the Shedding of Leaves -As the leaf gets older, it makes Less Auxin [Leaf Loss]
Selective Herbicides: Explain in terms of Plant Hormones-Selective Herbicides [Weed killers] made using Auxin -Majority of weeds in a Field growing are Broad-leaved, and Grass an Cereals are opposite, Narrow-leaves -Weed killers affect only the Broad leaved. Their normal Growth is disturbed from the Auxin, therefore killing them
Rooting Power: Explain in terms of Plant Hormones-Cutting is simply a bit of the Plant that was Cut off -A cutting can't grow in the soil, usually, but Rooting powder changes that, because it has Auxin -Roots quickly appear, as well as new Plants -Clones can be made Quickly
Producing Seedless Fruit: Explain in terms of Plant Hormones-Fruits, that has seeds, grow on Plants that have been Pollinated -However, if Auxin and Gibberellins are given to the Unpollinated Flowers, the Fruit can grow, but the seeds -This makes Parthenocarpic Fruit [Seedless Fruit]
Controlling Dormancy: Explain in terms of Plant Hormones-Seeds won't Germinate [Grow and Put out Shoots] until they have experienced certain Conditions. This is Dormancy -Seeds that are given Gibberellin can alter their Dormancy and can have them Germinate at a time of year where they Couldn't -Can ensure that they all Germinate at the same time
How can Ethene be used in Transporting food?-Ethen will make the Fruit want to Ripen. Fact -But Fruit is first picked Unripe so that its Hard - meaning it will not be Damaged during Transport or Storage -Ethene then Applied to make it Soft for me and you :)