14. A farmer using sustainable agriculrural practices will a. use increased crop

Question

14. A farmer using sustainable agriculrural practices will a. use increased crop diversity and fewer off the farm resources in order to reduce b. increase the use of chemicals to reduce labor and tillage costs. c. increase production in order to increase output, thus creating more income. d. invest money in the supporting industries of the agriculrural industry 15. Some farmers rotate their crops with legumes because decrcase the nitrogen content of the soil. a. legumes b. the roots of legumes contain nitrogen-fixing bacteria. e. legumes are pest-resistant. d. legumes fetch a high price in the market. greatest problem with nuclear energy is a. long term storage of radioactive wastes. b. the production of waste heat c. carbon dioside emissions through d. all of the above the decay of radioactive materials 17. The greenhouse effect occurs because a. greenhouse gases interact chemically to produce excess heat. b. there are too many greenhouses scattered across the Earth's surface c. carbon dioxide and other greenhouse gases trap infrared radiation in the Earth's atmosphere. the gases produced by human activities allow significantly more heat to pass out of the Earth's atmosphere. d. 18. Salt water intrusion is associated with a. natural gas fracking. b. the depletion of aquifers. c. the construction of dams and levees. d. the diversion of surface waters 19. Benefits of dams include all of the following except a. b. c. d. providing a more stable, year-round water supply in some regions. gencrating electricity. providing flood control for areas downstream increasing habitat quality for native fishes. 20. Which food would require the most water to a. a pound of lettuce b. a pound of rice c. a pound of beef d. a pound of com 21. Which is a consequence of sewage pollutioni presence of a. public health risks due to b. decreased ogen content of water c. nutricnt enrichment of water d. all of the above

Explanation / Answer

14. Sustainable agriculture practices involve promoting agrobiodiversity, using organic materials instead of chemicals, and bring together species of flora and fauna for mutual benefits and keeping ecosystems healthy. Thus, the option a) is correct as it states the importance of diversity which is how a farmer practices sustainable agriculture. Options b), c), d) are incorrect as they will not result in sustainability of environmental and economic resources.

15. Legumes are sources of nitrogen which keeps the soil healthy as the root grows deeper in the ground. Thus, option b) is correct as the legumes contain N-fixing bacteria in their roots and increase the fertility through increased nitrogen. Options a), c), d) do not state appropriate reasons as to why farmers rotate their crops with legumes, hence those options are incorrect.

16. The greatest problem with nuclear energy is the high amount of toxic radioactive waste produced that can be detrimental to the environment. Waste heat is used for running turbines and there is no significant carbon emission from nuclear energy. So, option a) is correct as it points out the problem of waste storage. Options b), c), d) are incorrect as they don't address any problem associated with nuclear energy.

17. The greenhouse gas effect occurs due to the blocking of infrared emissions from the Earth's surface by gases such as carbon dioxide. The emissions are commonly known as the outgoing longwave radiation. The trapping of such a radiation is responsible for the global warming as the heat is unable to escape out of Earth. Options a), b), d) are incorrect as none of them explains the concept of warming induced by greenhouse gases. Options c) is correct as it correctly links the concept of the greenhouse effect with the process of infrared radiation entrapment by the greenhouse gases.

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