Question

ICCESS ONLINE RESOURCES TECHNICAL RESOURCES LSUS RESOURCES Pelicans will contain more DDT than aquatic microscopic organisms due to Select one: A. Pesticide resistance B. Persistence in the environment C. Increased pesticide concentration in the food chain D. Broad range poisoning An agricultural practice that has contributed to eutrophication (water pollution) Select one: A. Deforestation B. Use of fertilizers C. Irrigation D. Over cultivation/grazing An agricultural practice in prairie ecosystems that increases the soil vulnerability to wind and water erosion is Select one: A. Deforestation B. Over cultivation/grazing C. use of fertilzers D. Irrigation OBI 9

Answer 1

• Pelicans will contain more DDT than aquatic microorganisms due to increased concentration in food chain.
• Use of fertilizers accumulated in soil and after rainfall it goes to lakes or ponds and causes eutrophication.
• Over cultivation and overgrazing are the main causes of soil erosion in prairies.