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13 Cards in this Set
- Front
- Back
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Tropism |
A plant's growth response toward or away from a stimulus. |
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Thigotropism |
Plant's response to touch |
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Touch, Gravity, Light |
Important stimuli that trigger growth responses, or tropisms in plants. |
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Hormone |
A chemical that affects how the plant grows and develops. |
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Auxin |
Speeds up the rate at which a plant's cells grow and controls a plant's response to light. |
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A plant's response to seasonal changes in the length of day or night. |
Photoperiodism |
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The number of hours of darkness that determines whether or not a plant will flower. |
Critical night length |
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Plants that flower when the nights are longer than a critical length. |
Short-day plants |
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Long-day plants |
Plants that flower when nights are shorter than a critical length. |
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Day-neutral plants |
Plants that have a flowering cycle that is not sensitive to periods of light and dark. |
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They bloom in spring or summer. |
Long-day plants |
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Short-day plants |
They bloom in fall or winter. |
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Dormancy |
Period when an organism's growth or activity stops. |
