HW on PLANTS AND THE ENVIRONMENT.

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UNIT 7. PLANTS AND THE ENVIRONMENT.

Chapter 26. Plant Ecology. This chapter is an introduction to the principles of ecology: the ecosystems, niches, food chains, biogeochemical cycles, and ecological succession. The major biomes of the world are discussed, with emphasis on the economic value of certain desert plants and the strategy of extractive reserves in the rain forest. The problems associated with rising levels of the greenhouse gas CO2 and the environmental consequences of global warming are addressed.

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UNIT 7. PLANTS AND THE ENVIRONMENT. Chapter 26. Plant Ecology. This chapter is an introduction to the principles of ecology: the ecosystems, niches, food chains, biogeochemical cycles, and ecological succession. The major biomes of the world are discussed, with emphasis on the economic value of certain desert plants and the strategy of extractive reserves in the rain forest. The problems associated with rising levels of the greenhouse gas CO2 and the environmental consequences of global warming are addressed. Answer the following questions: 1. What are the limits of the biosphere? What factors would limit the distribution of plants? What factors would limit the distribution of animals? 2. What are the components of an ecosystem? Detail the flow of energy in a food chain. 3. How do the concepts of habitat and niche overlap? How do they differ? Give examples. 4. It is clear that the greenhouse effect caused by rising levels of CO2 will have many dire consequences in agriculture. Would there be any benefits to plants from higher CO2 levels in the atmosphere? 5. List examples of primary and secondary succession and trace the transitional stages in each type of succession. 6. List and describe the major biomes found on the North American continent. Climbing up a mountain, the vegetational zones encountered are similar to the biomes passed on a journey north. Why? What is the altitudinal effect on temperature and precipitation? 7. Make a list of rain forest products obtained by extractive reserves available in local stores.
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