forces and work in the natural world. work is force over a distance if force is applied to an...
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![Page 1: Forces and Work in the Natural World. WORK Is force over a distance If force is applied to an object, and the object moves work has been done Plants can](https://reader036.vdocument.in/reader036/viewer/2022062519/5697bfe91a28abf838cb7034/html5/thumbnails/1.jpg)
Forces and Work in the Natural World
![Page 2: Forces and Work in the Natural World. WORK Is force over a distance If force is applied to an object, and the object moves work has been done Plants can](https://reader036.vdocument.in/reader036/viewer/2022062519/5697bfe91a28abf838cb7034/html5/thumbnails/2.jpg)
WORK• Is force over a
distance• If force is applied to
an object, and the object moves work has been done
• Plants can do work!
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Osmosis in plant cells
• Osmosis – movement of water through the semipermeable cell membrane
• When most plants are given water the roots take up as much water as it needs which is stored inside the cells (vacuoles) and the plant looks normal
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Osmosis in Plants
• When a plant does not receive enough water there is a higher concentration of water inside the plant cells than outside so the water diffuses out of the cell
• This causes the plant to wilt
![Page 5: Forces and Work in the Natural World. WORK Is force over a distance If force is applied to an object, and the object moves work has been done Plants can](https://reader036.vdocument.in/reader036/viewer/2022062519/5697bfe91a28abf838cb7034/html5/thumbnails/5.jpg)
Turgor Pressure• Pressure of
water molecules against the cell wall that allows plants to stand up straight.
![Page 6: Forces and Work in the Natural World. WORK Is force over a distance If force is applied to an object, and the object moves work has been done Plants can](https://reader036.vdocument.in/reader036/viewer/2022062519/5697bfe91a28abf838cb7034/html5/thumbnails/6.jpg)
Turgor Pressure
• Remember plant cells are surrounded by a rigid (resists bending) cell wall. Just beneath the cell wall is the cell membrane
![Page 7: Forces and Work in the Natural World. WORK Is force over a distance If force is applied to an object, and the object moves work has been done Plants can](https://reader036.vdocument.in/reader036/viewer/2022062519/5697bfe91a28abf838cb7034/html5/thumbnails/7.jpg)
Turgor Pressure
• Also remember the plant cell has a much larger vacuole than an animal cell
• This vacuole is used to store food and water for the plant cell
![Page 8: Forces and Work in the Natural World. WORK Is force over a distance If force is applied to an object, and the object moves work has been done Plants can](https://reader036.vdocument.in/reader036/viewer/2022062519/5697bfe91a28abf838cb7034/html5/thumbnails/8.jpg)
Turgor Pressure
• When a plant has the right amount of water then the turgor pressure inside the cell will help support the plant and the plant will stand upright
• When a plant does not have enough water the turgor pressure inside the cell is decreased and the plant is not able to stand upright as well
• If the plant does not get any water, it will wilt completely and eventually die
![Page 9: Forces and Work in the Natural World. WORK Is force over a distance If force is applied to an object, and the object moves work has been done Plants can](https://reader036.vdocument.in/reader036/viewer/2022062519/5697bfe91a28abf838cb7034/html5/thumbnails/9.jpg)
No Turgor Pressure Turgor Pressure
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Tropism• Tropism – a plant’s response that results in
plant growth toward or away from a stimulus.–Positive – growing TOWARD the stimulus–Negative – growing AWAY from the
stimulus
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Stimulus: Light
• Response: Phototropism
• Tendency for plants to grow towards sunlight
• Why is this beneficial for the plant?
• 18 Sec Video
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Stimulus: Gravity• Response: Geotropism (or Gravitropism)• A plant’s growth in
response to gravity.–Negative: Stems grow
away from gravity–Positive: Roots grow
towards gravitySeeds growing in response to gravity – select CORN
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Stimulus: Touch• Response:
Thigmotropism – a plants growth in response to touch
• Examples:–Vines –Carnivorous
Plants–Roots avoiding
contact
Venus Fly Trap Video