Sophia - Environmental Science - Unit 3 Challenge 1

Sophia - Environmental Science - Unit 3 Challenge 1 1 — Human Population Growth Determine the amount of natural resources required for each person to live. In the United States, the standard of living requires about five hectares per person. If every person on Earth required five hectares to live, we would need __________ to sustain the current population. • a.) five Earths • b.) four Earths • c.) two Earths • d.) three Earths 2 — Agriculture Practices: Plant Sources Identify key aspects of plant sources related to agriculture practices. Which three subsistence crops supply over 50% of human caloric needs worldwide? • a.) Wheat, corn and rice • b.) Barley, rice and corn • c.) Corn, rice and potatoes • d.) Rice, potatoes and wheat 3 — Agriculture Practices: Meat Sources Recognize the important characteristics of meat sources related to agriculture practices. Which of the following statements about meat as a food source for humans is FALSE? • a.) Examples of domesticated meat sources include cattle, pigs and chickens. • b.) Of the grain grown in the United States, 10% is used to feed animals. • c.) U.S. citizens eat almost 30 times as much meat as Indian citizens eat. • d.) Most meat is consumed in developed countries. 4 — World Nutrition: Factors Differentiate between the types of factors that affect world nutrition. War and costs that interfere and prevent the distribution of food are examples of __________ factors. • a.) political • b.) industrial • c.) technological • d.) environmental 5 — World Nutrition: Causes Determine the main causes of famine. Which of the following factors do NOT contribute to famine, or insufficient food supply in a specific area? • a.) Religious practices • b.) Floods or fires • c.) Geographic barriers • d.) Resource hoarding 6 — Agriculture Impacts: Agroecosystems Compare characteristics of agroecosystems to natural ecosystems. Agriculture has changed natural environments and ecosystems and created agroecosystems. Which of the following is a characteristic of an agroecosystem? • a.) Allows multiple species to exist • b.) Degrades water quality • c.) Promotes ecological succession • d.) Maintains soil quality 7 — Agriculture Impacts: Agricultural Practices Differentiate between the types of approaches to improve agricultural practices. Which of the following approaches is most likely associated with organic agricultural practices? • a.) Planting genetically modified seeds • b.) Practicing no-till farming • c.) Forming new topsoil • d.) Using natural pesticides and fertilizers 8 — Fertilizers and Pesticides: Impacts of Fertilizers Identify the positive and negative effects of fertilizers. Which of the following is a benefit of using fertilizers? • a.) Fertilizers produce a well-supplied water system for crops. • b.) Fertilizers wipe out undesirable organisms that ruin crops. • c.) Fertilizers add nutrients, like nitrogen, to the soil. • d.) Fertilizers help build crops that are resistant to bugs that are damaging.