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Importance of Plants

Importance of Plants. Plants and People. Produce virtually all our food Provide medicine Influences Earth’s cycles water, oxygen, carbon dioxide, and mineral nutrients. Botany. Study of plants More than 350,000 plant species Fewer than 20 plant species provide our food. Cultivation.

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Importance of Plants

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  1. Importance of Plants Plants and People

  2. Produce virtually all our food • Provide medicine • Influences Earth’s cycles • water, oxygen, carbon dioxide, and mineral nutrients

  3. Botany • Study of plants • More than 350,000 plant species • Fewer than 20 plant species provide our food

  4. Cultivation • Approx. 11,000 yrs ago in Middle East • Wheat, barley, lentil, and peas • 1st domesticated • Agriculture • Cultivar (Cultivated and variety) • Specific characteristic selected by humans

  5. Food Crops • Classified partly by use and family • Cereals • Rice, wheat, corn, oats, sorghum, rye, and millet • 50% of worldwide calories

  6. Food Crops • Root crops • Roots or underground stems • Rich in carbohydrates • Beets, radishes, carrots, rutabagas, turnips, potatoes, and yams

  7. Food Crops • Legumes • Peas, beans, soybeans • Bear seeds in pods • Improve nitrogen content in soil • Symbiotic relationship with bacteria • Rhizobium

  8. Food Crops • Fruits, Vegetables, and Nuts • Spices, Herbs, and Favorings

  9. Food Production • Mass production of crops • Fertilizers • Pesticides • Consequences • Soil erosion • Depletion of fossil fuel and water supplies • Pollution and destruction of habitat

  10. Nonfood Uses • Medicines • Clothing and Fabric Dyes • Fuels • Other Uses • Ornamental • Tourist attraction • Energy conservation

  11. Plants and the Environment • Plant ecology • Producers make food for consumers • Photosynthesis • Organic compounds • Inorganic nutrients • Maintenance of soil

  12. Interactions • Plant and animal • Pollination • Seed dispersal • Plant and microbe • Plant and humans • Food, shelter, medicine, etc • Weeds • Harmful plants

  13. Critical Thinking • Discuss how the artificial selection by humans play a role in the origin of agricultural crops? How is artificial selection similar to natural selection? • Explain why plant materials entering the country are screened by government inspectors • If all animals disappeared from the Earth, what would the positive and negative effects be on plants?

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