UEC Junior 01
Terms
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There are two kinds of irritability in plants
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1) tropism
2) Nastic movement
- Tropism
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1) phototropism
2) hydrotropism
3) thigmotropism
4) chemotropism
5) geotropism
- Phototropism
- The response of plant organs to the stimulus of light
- Geotropism
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The response ofplant organs to gravity
- Hydrotropism
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The response of plant organs to water
- Thigmotropism
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The response of plant toward external object its contacted
- Chemotropism
- The movement in response to chemical substances
- Auxin
- The chemical that control plant's response to light and gravity
- Example of Thigmotropism
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1) Tendril of cucumber, pumpkin,
2) Clasping stem of morning glory
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Example of Chemotropism
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Pollen tube grow toward the ovary
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Nastic Movement
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1) Closing Movement
2) Sleeping Movement
3) Prey-catching Movement
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Sleeping Movement
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1)Oxalis
2) Flame of forest
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Closing Movement
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Mimosa leaves
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Prey-catching Movement
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Venus flytrap
- Positive geotropism and negative phototropism
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Root of plant
- Leaflets of leguminous plant bend and close during the night but open during the day.
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Sleeping Movement
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Positive phototropism and negative geotropism
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Stems of plants
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The young chrysanthemum flower closes in the evening but reopens at dawn
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Slepping Movement
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Tendrils of vines climb up its support
- Thigmotropism
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The leaves of the flytrap hinge together when a fly lands on it
- prey-catching movement
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The indoor potted plant will bend towards the window
- phototropism