ࡱ> _ Z)bjbj bb1!(NNdddxxxxxc$L#######$%a(l$d$;$ d# # .6 f:R #3$0c$ ( L( (d 40" $$` :c$(N n: Name Class Date  Ecosystems and Communities Chapter Test A (removed questions on Freshwater and Marine Ecosystems) Multiple Choice Write the letter that best answers the question or completes the statement on the line provided. _____ 1. How does an areas weather differ from the areas climate? a. Weather involves temperature and preciapitation and climate involves only temperature. b. An areas weather depends on where it is located on Earth and the areas climate does not. c. An areas weather does not change very much and an areas climate changes many times. d. Weather is the areas day-to-day conditions and climate is the areas average conditions. _____ 2. The tendency for warm air to rise and cool air to sink results in a. global wind patterns. c. the seasons. b. ocean upwelling. d. regional precipitation. _____ 3. An organisms niche is a. the range of physical and biological conditions in which an organism lives and the way it obtains what it needs to survive and reproduce. b. all the physical and biological factors in the organisms environment. c. the range of temperatures that the organism needs to survive. d. a full description of the place an organism lives. _____ 4. No two species can occupy the same niche in the same habitat at the same time a. because of the interactions that shape the ecosystem. b. unless the species require different abiotic factors. c. because of the competitive exclusion principle. d. unless the species require different biotic factors. _____ 5. What would likely happen if the population of the bird species shown in the ecosystem in Figure 41 were to suddenly decrease? a. The fish population would decrease. b. The fish population would increase. c. The fish population would remain the same. d. Fish would leave the ecosystem. _____ 6. A wolf pack hunts, kills, and feeds on a moose. In this interaction, the wolves are a. hosts. c. mutualists. b. prey. d. predators. _____ 7. A symbiotic relationship in which one organism is harmed and another benefits is a. mutualism. c. commensalism. b. parasitism. d. predation. _____ 8. What is one difference between primary and secondary succession? a. Primary succession is rapid and secondary succession is slow. b. Secondary succession begins on soil and primary succession begins on newly exposed surfaces. c. Primary succession modifies the environment and secondary succession does not. d. Secondary succession begins with lichens and primary succession begins with trees. _____ 9. A tropical rain forest may not return to its original climax community after which of the following disturbances? a. burning of a forest fire c. volcanic eruption b. clearing and farming d. flooding after a hurricane _____ 10. Which two biomes have the least precipitation? a. tropical rain forest and temperate grassland b. tropical savanna and tropical dry forest c. tundra and desert d. boreal forest and temperate woodland and shrubland _____ 11. Which landforms are not classified into a major biome? a. prairies b. mountain ranges c. coastlines d. islands Completion Complete each statement on the line provided. 16. Over time, some plants growing in an area are crowded out by other plants. The new plants use up water and nutrients needed by the previous plants. The disappearance of the first plants is due to . 17. Predator is to prey as herbivore is to . 18. Some orchids grow high on trees so that they can get enough light for photosynthesis. The trees are unaffected by the presence of the orchids. The relationship between the orchids and the trees is an example of . 19. Regrowth of grasses, ferns, wildflowers, and saplings after a forest fire is an example of succession. Short Answer In complete sentences, write the answers to the questions on the lines provided. 21. How are microclimates related to climates?  22. The concentration of greenhouse gases in the atmosphere can and does change. Would conditions on Earth be worse if the concentration of these gases increased or if it decreased? Use Figure 42 to explain your answer. 23. How do predators affect the populations of their prey? 24. Deserts vary greatly depending on elevation and latitude. What characteristic do all deserts share? Essay Write the answer to each question on the lines provided. 31. Explain how ocean currents originate and affect Earths climates. 32. Describe the stages of primary succession in land environments, including the roles played by grasses, lichens, trees, mosses, and shrubs. Deer and Wolf Populations on an Arizona Plateau, 19101935  33. Figure 44 shows a decrease in the deer population after 1925. Give one possible reason for this population decline. Explain your reasoning. 34. The general characteristics of temperate grasslands found in the United States, Central Asia, and Argentina are similar. Identify some characteristics of temperate grasslands, and explain why these regions share characteristics in spite of the distance between the locations. Mention climate, climate zones, biomes, and biotic and abiotic factors in your answer. Answers Chapter 4Test A Multiple Choice 1. d 2. a 3. a 4. c 5. b 6. d 7. b 8. b 9. b 10. c 11. b 12. c 13. c 14. a 15. b Completion 16. competitive exclusion 17. plant 18. commensalism 19. secondary Short Answer 21. An areas climate is made up of the average conditions for that area over long periods. A climate area can be divided into several microclimates because environmental conditions can vary over small distances. 22. Accept any response that is properly supported by an explanation. Sample answer: Conditions on Earth would be worse if the concentration of greenhouse gases increased because the amount of heat trapped by the gases would increase. This increase in global temperature would change climates on Earth. Alternate answer: Conditions on Earth would be worse if the concentration of greenhouse gases decreased because the amount of heat escaping into space would increase. This increased loss of heat would decrease global temperature and would change the climates on Earth. 23. Predators keep the population of their prey from getting too large by eating the prey animals. 24. A desert biome is defined as having less than 25 cm of annual rainfall. Using Science Skills Essay 31. Cold water near the poles sinks and then flows parallel to the ocean bottom, eventually rising again in warmer regions through a process called upwelling. Meanwhile, surface water is moved by winds. In both cases, the water flow creates ocean currents. Like air currents, ocean currents transport heat within the biosphere. Surface ocean currents warm or cool the air above them, thus affecting the weather and climate of nearby landmasses. 32. Primary succession occurs on newly exposed surfaces, such as a fresh lava flow that has destroyed the previous ecosystem. The first organisms to appear are lichens that colonize the newly formed volcanic rock. Over time, lichens break down the rock, fix atmospheric nitrogen, and add organic material as they decompose, creating soil. Various types of plants, including mosses and grasses, can then take root in the thin layer of soil. As the soil gets thicker and richer from decomposing organisms, seeds of shrubs and trees may take root. A characteristic ecological community may eventually dominate the area. 33. Competition between deer probably caused the population decline. The deer population grew so much that there were not enough resources to support all the deer. The deer had to compete for resources and many died. 34. Temperate grasslands in the United States, Central Asia, and Argentina belong to the same biome. They share the abiotic characteristics of hot, dry summers, cold winters, moderate precipitation, fertile soils, drought, and susceptibility to wildfires. They share the biotic characteristics of lush perennial grasses adapted to cold and fire. All of these grasslands are found in temperate biomes, even though they are far from one another, because the angle at which the sun strikes Earth in these areas is similar. Since they are in the same biome, these areas have similar climates. 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