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13 Cards in this Set
- Front
- Back
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Tropism |
A plant's response toward or away from a stimulus. |
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Three important stimuli that trigger growth responses or tropisms in plants. |
gravity, light, touch |
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hormone |
a chemical that affects how the plant grows and develops |
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auxin |
A plant hormone that speeds up the rate at which a plant's cells grow and controls a plant's response to light. |
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photoperiodism |
A plant's response to seasonal changes in the length of night and day.ritc |
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critical night length |
The number of hours of darkness that determines whether or not a plant will flower. |
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dormancy |
A period when a plant's growth or activity stops. |
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short-day plants |
Plants that flower when the nights are longer than a critical length. They bloom in fall or winter |
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long-day plants |
Plants that flower when nights are shorter than a critical length. They bloom in spring or summer. |
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day-neutral plants |
Plants that have a flowering cycle that is not sensitive to periods of light and dark. They can bloom year-round depending on the weather. |
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negative tropism |
plant grows away from a stimulus. |
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positive tropism |
plant grows toward a stimulus |
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thigmotropism |
plants response to touch |
