Biology 25.2
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Transcript of Biology 25.2
![Page 1: Biology 25.2](https://reader035.fdocuments.net/reader035/viewer/2022081421/55794a0dd8b42a31678b4faa/html5/thumbnails/1.jpg)
25-2 Plant ResponsesCh. 25: Plant Responses and Adaptations
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Tropism
Response of a plant to an external stimulus
![Page 3: Biology 25.2](https://reader035.fdocuments.net/reader035/viewer/2022081421/55794a0dd8b42a31678b4faa/html5/thumbnails/3.jpg)
Thigmotropism
Response of plants to touch
![Page 4: Biology 25.2](https://reader035.fdocuments.net/reader035/viewer/2022081421/55794a0dd8b42a31678b4faa/html5/thumbnails/4.jpg)
Short-day plant
Plant that flowers when daylight is short
![Page 5: Biology 25.2](https://reader035.fdocuments.net/reader035/viewer/2022081421/55794a0dd8b42a31678b4faa/html5/thumbnails/5.jpg)
Long-day plant
Plant that flowers when days are long
![Page 6: Biology 25.2](https://reader035.fdocuments.net/reader035/viewer/2022081421/55794a0dd8b42a31678b4faa/html5/thumbnails/6.jpg)
Photoperiodism
Response of plants to periods of light and darkness
![Page 7: Biology 25.2](https://reader035.fdocuments.net/reader035/viewer/2022081421/55794a0dd8b42a31678b4faa/html5/thumbnails/7.jpg)
Phytochrome
Plant pigment responsible for photoperiodism
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Dormancy
Period of time during which a plant embryo is alive but not growing
![Page 9: Biology 25.2](https://reader035.fdocuments.net/reader035/viewer/2022081421/55794a0dd8b42a31678b4faa/html5/thumbnails/9.jpg)
Abscission Layer
Layer of cells at the petiole that seals off a leaf from the vascular system
![Page 10: Biology 25.2](https://reader035.fdocuments.net/reader035/viewer/2022081421/55794a0dd8b42a31678b4faa/html5/thumbnails/10.jpg)
Key Concept
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.
![Page 11: Biology 25.2](https://reader035.fdocuments.net/reader035/viewer/2022081421/55794a0dd8b42a31678b4faa/html5/thumbnails/11.jpg)
Key Concept
Photoperiodism in plants is responsible for the timing of seasonal activities such as flowering and growth
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Key Concept
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.