unit 7--plants chapter 25 plant responses & adaptations
TRANSCRIPT
![Page 1: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/1.jpg)
Unit 7--Plants
Chapter 25
Plant Responses & Adaptations
![Page 2: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/2.jpg)
Plant Hormones
• Auxin = first discovered
• located in growing tips of roots/stems
• for stem elongation
• inhibits bud growth
• leaf & fruit drop
![Page 3: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/3.jpg)
Plant Hormones
• Ethylene = for fruit ripening & drop or leaf & flower drop
![Page 4: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/4.jpg)
Place fruits in a brown bag to trap ethylene gas release to speed up ripening
![Page 5: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/5.jpg)
Plant Hormones
• Gibberellins = for seed germination, fruit development & stem elongation
![Page 6: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/6.jpg)
Tropisms
• Growth response toward a stimulus
• Phototropism = toward light
• Ex: sunflower
![Page 7: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/7.jpg)
Tropisms• Gravitropism (or geotropism)
• toward earth’s center
• Ex: roots (positive) & stems (negative)
![Page 8: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/8.jpg)
Tropisms
• Thigmotropism =
• toward a support or something “touched”
• Ex: tendrils on a climbing vine
![Page 9: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/9.jpg)
Modified Leaves
• Cactus spines
• Tendrils
• Carnivorous plants
![Page 10: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/10.jpg)
Specialized Plants
• Parasitic plants
– Ex: mistletoe
• Epiphytes
– Ex: orchids, ball moss
![Page 11: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/11.jpg)
Classification by life span
• Annuals =– entire life cycle
in one growing season
• Ex: tomato plant
![Page 12: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/12.jpg)
Classification by life span
• Biennials – lives through two
growing seasons, separated by dormancy
• Ex: cabbage & carrot
![Page 13: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/13.jpg)
![Page 14: Unit 7--Plants Chapter 25 Plant Responses & Adaptations](https://reader035.vdocuments.us/reader035/viewer/2022062301/56649f345503460f94c52098/html5/thumbnails/14.jpg)
Classification by life span
• Perennials =– live many years
and through many periods of dormancy
– Ex: trees, shrubs– Also, bluebonnets