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- Emergent vegetation grows in the __________ zone of freshwater lakes, (a) littoral (b) limnetic (c) profundal (d) neritic (e) intertidalWhy is the tundra treeless? a. lack of sufficient water b. permanently frozen ground c. winters too harsh d. too many firesWhich biogeochemical cycle does not have a gaseous component but cycles from the land to sediments in the ocean and back to the land? (a) carbon cycle (b) nitrogen cycle (c) phosphorus cycle (d) hydrologic cycle (e) neither a nor c has a gaseous component
- Explain how streams can cleanse themselves ofoxygen-demanding wastes and how these cleansing processes can be overwhelmed. What is wastewater? Describe the state of stream pollution inmore-developed and less-developed countries.Give two reasons why lakes and reservoirs cannotcleanse themselves of pollutants very well. Define and distinguish between eutrophication and cultural eutrophication. List three ways to prevent orreduce cultural eutrophication. What are the majorsources of groundwater contamination in the UnitedStates? Explain why groundwater cannot cleanseitself very well. List three ways to prevent or cleanup groundwater contamination. List some ways topurify drinking water. Describe the purification ofdrinking water in more-developed and less-developedcountries. Describe environmental problems causedby the widespread use of bottled water. How are lawsused to protect drinking water in the United States?List three ways to strengthen the U.S. Safe DrinkingWater Act. Describe how…What would most likely happen if too many nutrients entered an estuary? O a. Algal blooms would decrease, leaving few food resources for fish. O b. Nutrients would sink to the bottom, increasing soil deposition O C. Nutrients would be used up by the fish and plants, keeping the estuary in balance. d. Algal blooms would lower dissolved oxygen levels, causing fish to suffocate. O e. Nutrients would float to the bottom, increasing soil deposition Corn/Maize seem to have originated in which centre of origin- Answer: Scientific or botanical name of rice is ofWhich trophic level(s) must be present to sustain any ecosystem?a. producers onlyb. producers and consumersc. producers, detritivores, and decomposersd. producers, consumers, detritivores, and decomposers
- Explain how streams can cleanse themselves andhow these cleansing processes can be overwhelmed.What is wastewater? Describe the state of streampollution in more- and less-developed countries.Give two reasons why lakes cannot cleanse themselves as readily as streams can. Distinguish betweeneutrophication and cultural eutrophication. Listways to prevent or reduce cultural eutrophication.Explain why groundwater cannot cleanse itself verywell. What are the major sources of groundwatercontamination in the United States? List ways to prevent or clean up groundwater contamination. Listsome ways to purify drinking water. Describe the environmental problems caused by the widespread useof bottled water.Thelargest reservoir of phosphorus in most ecosystems is phosphorus:a. inthe atmosphere.b.dissolved in water.c. inrocks and sediments.d.bound in animal tissues.e.bound in plant tissues.Whichstatement about changing ecosystem properties during succession is false?a.Biomass increasesb.Community respiration increasesc.Primary production increasesd.Soil depths decreasee.Stream spiraling lengths decrease
- In large lakes, there are four distinct zones. Which of the following is the exception? Benthic O Littoral Bathyal O Limnetic O ProfundalThe number of trophic levels in an ecosystyem are limited.Comment.The control of water for irrigation and human use was a critical factor in developing all city-states throughout the world. Today, as the world’s environment changes, water has become a serious concern for billions of people. Very few cultures achieved the level of water control like the Inca and the cultures that preceded the Inca. From the Nasca irrigation system to the cleansing of water in Machu Picchu, the Inca developed water systems from the highest mountains to the coastal deserts. So the question is Explain thoroughly how the Inca Empire and the different techniques they used to control and clean water?