aim: how do plants respond to changes in the environment?
TRANSCRIPT
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Aim: How do plants respond to changes in the environment?
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Plant Hormones:
Plant hormones are responsible for controlling manyplant functions including: seed germination, growth, flowering, & leaf production.
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Plant Hormones: Auxin
Auxin is a hormone produced in the stem of a plant that allows for plant growth (primary – length).
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What does this experiment tell us about the effects of auxin?
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How does auxin work?
Auxin builds up on the shaded side of the plant &Stimulates growth beneath the tip. The cells on theshaded side are exposed to more auxin they grow morethan the side exposed to the light.
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What are tropisms?
Tropisms are growth responses that cause parts ofa plant to grow slowly toward or away from a stimulus.
1)Thigmotropism – a change in plant growth due totouch.
2)Phototropism – the growth of a plant toward or away from light.
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What are tropisms?
3)Gravitropism – a plant’s response to gravity.Roots grow downward and stems grow upward inresponse to gravity.
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Other Plant Hormones:Cytokinins – encourages branching of plants.
Gibberellins – stimulate growth of stems & fruit development
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Other Plant Hormones:Abscisic Acid – induces dormancy (stops growing) in plants & seeds. Also causes the closing of the stomates.
Ethylene – promotes leaf drop.
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How do plants respond to changes in day length & seasons?
Photoperiodism – plants use the relative lengths of dayand night to detect the time of year and respond tothese changes.
Short-Day Plants Flower in the winter
Long-Day PlantsFlower in the Summer