Chapter 21 - Part IV Enhance E nh your understanding of...

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Part IV Media Chapter 21 Plant Organization and Homeostasis Animations Vascular System of Plants Woody Dicot Videos Seedling Growth Straight Corn Rows Chapter 22 Transport and Nutrition in Plants Animation Root Nodule Formation Video Vampire Weed Virtual Lab Plant Transpiration Chapter 23 Control of Growth and Responses in Plants Videos No Mow Grass Plant Tactile Response Plant Thorn Defense Thorn Tree and Ants Chapter 24 Reproduction in Plants Videos Pollinators Fruit Bat Seed Dispersal Enhance your understanding of plants through media and applications! E n h t h r 428
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Applications Chapter 21 Plant Organization and Homeostasis HOW BIOLOGY AFFECTS OUR LIVES Monocots Serve Humans Well 435 HOW LIFE CHANGES The First Forests 443 Chapter 22 Transport and Nutrition in Plants HOW SCIENCE PROGRESSES Competition for Resources Is One Aspect of Biodiversity 453 HOW BIOLOGY IMPACTS OUR LIVES Plants Can Clean Up Toxic Messes 457 Chapter 23 Control of Growth and Responses in Plants HOW BIOLOGY IMPACTS OUR LIVES Eloy Rodriguez Has Discovered Many Medicinal Plants 484 Chapter 24 Reproduction in Plants HOW LIFE CHANGES Evolution of Seed Plants 492 HOW LIFE CHANGES Evolution of Insect Pollination 493 Plants Are Homeostatic 429
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Plants Fuel You (and Soon Your Car) G rasses are among the most successful plant groups, and they have long produced food crops for us such as corn, wheat, and rice. Now, a particular grass called switchgrass ( Panicum virgatum ) could become the biofuel that will drive your car. A biofuel is a liquid fuel, such as ethanol, diesel fuel, or even gasoline, made from plant materials. The technology is not here yet, but it is being developed. In the past, switchgrass was a significant part of the tall- grass prairie that covered much of the Midwest before settlers turned it into farms. Switchgrass doesn’t look like the grass in your front lawn. It’s strong and tough, as it would have to be since it can be 30.80 cm (10 ft) high. The roots are extensive and spread out into the soil to collect inorganic nutrients and water. Bioengineering is making switchgrass even more hardy and able to grow on marginal land that is too dry and nutrient-poor for CHAPTER OUTLINE Plants Have Three Vegetative Organs 21.1 Flowering plants typically have roots, stems, and leaves 432 21.2 Flowering plants are either monocots or eudicots 434 The Same Plant Cells and Tissues Are Found in All Plant Organs 21.3 Plants have specialized cells and tissues 436 21.4 The three types of plant tissues are present in each organ 438 Plant Growth Is Either Primary or Secondary 21.5 Primary growth lengthens the root and shoot systems 440 21.6 Secondary growth widens roots and stems 442 Foliage Leaves Are Adapted to Photosynthesize 21.7 Leaves are organized to carry on photosynthesis 444 Plants Maintain Internal Equilibrium 21.8 Various mechanisms help plants maintain homeostasis 445 APPLICATIONS HOW BIOLOGY IMPACTS OUR LIVES Monocots Serve Humans Well 435 HOW LIFE CHANGES The First Forests 443 21 Plant Organization and Homeostasis Switchgrass can be ten feet high.
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