Tropism<br />Response of a plant to an external stimulus<br />
Thigmotropism<br />Response of plants to touch<br />
Short-day plant<br />Plant that flowers when daylight is short<br />
Long-day plant<br />Plant that flowers when days are long<br />
Photoperiodism<br />Response of plants to periods of light and darkness<br />
Phytochrome<br />Plant pigment responsible for photoperiodism<br />
Dormancy<br />Period of time during which a plant embryo is alive but not growing<br />
Abscission Layer<br />Layer of cells at the petiole that seals off a leaf from the vascular system<br />
Key Concept<br />Plant tropisms include gravitropism, phototropism, and thigmotropism. Each of these responses demonstrates the ability of plants to respond effectively to external stimuli, such as gravity, light, and touch.<br />
Key Concept<br />Photoperiodism in plants is responsible for the timing of seasonal activities such as flowering and growth<br />
Key Concept<br />As cold weather approaches, deciduous plants turn off photosynthetic pathways, transport materials from leaves to roots, and seal leaves off from the rest of the plant.<br />
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