Gebberellin stimulates seed germination,stem growth by stem elongation(plants become tall) and flowering.
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What other plant hormone does Gibberellin used with to help the plants grow really tall?
Gibberellin and Auxin work togetehr to have a big effect on plant growth e.g.together they help plants grow very tall
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Explain how a particular plant hormone causes aging leaves to break of the plant.
Ethene is produced by aging leaves,stimulates cells that connect the leaf to rest of plant to expand-breaks cell walls & causes the leaf to fall off the plant
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Explain the role of Auxin in the shedding of leaves
Auxin inhibits shedding of leaves. Auxins produced by younger leaves.As leaves get older,they produce less auxin,leading to leaf loss
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What does Ethene do?
Stimulates enzymes that cause the fruit to ripen
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Explain the use of Auxin in weedkillers/selective herbicides?
Selective Herbicides/Weedkillers have been made using auxins which only affect broad leaved plants(most weeds).They work by totally disrupting the weeds' normal growth patterns-soon kills them-whilst leaving the grass & crops untouched
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Name other uses of Auxin
Auxin is used in rooting powder-you take a cutting of a plant dip it in soil,then plant it -the auxin stimulates root growth & the cutting starts growing as a new plant.Also,used with Gibberellin on unpollinated flowers-produces Parthenocarpic Fruit
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Parthenocarpic Fruit?
Fruit with no seeds
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How does a fruit have seeds in it?
Fruits with seeds normally only grow on plants pollinated by insects,so no pollination=no fruit + no seeds
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Explain the effect Gibberellin has on seeds.
Most seeds won't germinate till they've been thru certain conditions e.g.period of cold/dryness-called Dormancy.Seeds can be treated with Gibberellin to alter dormancy & make them germinate than when they normally would
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Give a benefit of using Gibberellin on seeds?
it makes sure all seeds germinate at the same time
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Other cards in this set
Card 2
Front
What other plant hormone does Gibberellin used with to help the plants grow really tall?
Back
Gibberellin and Auxin work togetehr to have a big effect on plant growth e.g.together they help plants grow very tall
Card 3
Front
Explain how a particular plant hormone causes aging leaves to break of the plant.
Back
Card 4
Front
Explain the role of Auxin in the shedding of leaves
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