Sci.ls Unit 1 Ecosystems Past Paper PDF 11/26/2024 (Systemwide)

**Test Name: SCI.LS - Unit 1 - Ecosystems (Systemwide)** **Test ID: 3208220** **Date: 11/26/2024** **[Section 1]** **1.** The diagram below represents a partial food web. Which organisms in this food web decompose materials and recycle wastes? **A.** Mice **B.** Foxes **C.** Green plants **...

**Test Name: SCI.LS - Unit 1 - Ecosystems (Systemwide)** **Test ID: 3208220** **Date: 11/26/2024** **[Section 1]** **1.** The diagram below represents a partial food web. Which organisms in this food web decompose materials and recycle wastes? **A.** Mice **B.** Foxes **C.** Green plants **D.** Bacteria **2.** The diagram below represents a pond area.  The original source of energy for this pond area is the - **A.** fish **B.** sun **C.** water **D.** duck **3.** The diagram represents a food web. Look at the diagram on your screen. Red from top to bottom, left to right. Mountain lions, snakes, raccoons, coyotes, birds, frogs, deer, grasshoppers, plants. (Not drawn to scale) ✅ CRUN\_H001D49.2 Test Mountain Lion Food Web Export\_2024.08.06.12.08.00.320.04.00 According to this food web, which organism is a 1st-order consumer? **A.** Coyote **B.** Deer **C.** Frog **D.** Raccoon **4.** The diagram represents a food web.  ✅ CRUN\_H001D49.2 Test Mountain Lion Food Web Export\_2024.08.06.12.08.00.320.04.00 Which food chain best represents the transfer of energy from plants to mountain lions in this food web? **A.** plants → deer → birds → mountain lions **B.** plants → deer → coyotes → mountain lions **C.** plants → grasshoppers → frogs → mountain lions **D.** plants → grasshoppers → birds → mountain lions **5.** Directions: Click the box to select each correct answer. You must select two correct answers. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Base your answer to this question on the energy pyramid below, which shows feeding relationships between organisms in a section of the Hudson River near Albany, New York. Some specific examples of organisms in the pyramid are provided. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Why is the bottom of the energy pyramid larger than the top? Select the two best answers. **A.** As you move up the pyramid, the amount of energy available decreases. **B.** The bottom layer of the pyramid has the least food and/or energy. **C.** There are fewer organisms at the base/bottom of the pyramid. **D.** The invertebrates are placed directly above the phytoplankton in this energy pyramid. **E.** Some energy is lost to the environment as heat at each level, making the top smaller. **6.** Organisms are classified as producers if they are able to - **A.** remove oxygen from the air **B.** remove microbes from the soil **C.** make their own food **D.** make carbon dioxide **7.** Directions: Drag and drop the labels to the correct box. Complete the diagram below by placing each of the labels in the appropriate box below its description.  -- ----------------------- --  -- ----------------------- --  **8.** Which change would most likely cause a decrease in the number of squirrels living in an area? **A.** A decrease in the number of predators **B.** A decrease in competition between the squirrels **C.** An increase in available food **D.** An increase in the number of forest fires **9.** Hawks and owls are both birds of prey and often live in the same areas. Which of the following factors most likely limits competition for prey between hawks and owls living in the same area? **A.** Hawks and owls have different predators. **B.** Hawks have speckled eggs and owls have white eggs. **C.** Hawks and owls are camouflaged by different feather colors. **D.** Hawks are active during the day and owls are active during the night. **10.** **Read the information and diagram below and answer the questions that follow.** Sharks are large fish that live in the ocean. Hammerhead sharks are a part of a marine ecosystem, as shown in the food web.     Look at the image on your screen. Red top to bottom, left to right. Hammerhead shark. Cownose ray. Oyster. Soft-shell clam. Hard-shell clam. Bay scallop. Zooplankton. Phytoplankton. ✅ CRUN\_H001D42.2 Test Ocean Food Web - Diagram Export\_2024.08.06.12.10.18.460.04.00 Which of the following best describes the role that hammerhead sharks play in the ecosystem? **A.** The sharks act as a food source for clams, oysters, and scallops. **B.** The sharks compete with cownose rays for access to nutrients in the environment. **C.** The sharks break down the remains of zooplankton and phytoplankton, returning nutrients to the environment. **D.** The sharks limit the population size of cownose rays, preventing them from overfeeding on clams, oysters, and scallops. **11.** **Read the information and diagram below and answer the questions that follow.** Sharks are large fish that live in the ocean. Hammerhead sharks are a part of a marine ecosystem, as shown in the food web.      ✅ CRUN\_H001D42.2 Test Ocean Food Web - Diagram Export\_2024.08.06.12.10.18.460.04.00 The diagram represents one process that transfers energy in the marine ecosystem. The process occurs in which of the following organisms? **A.** oysters **B.** hammerhead sharks **C.** phytoplankton **D.** cownose rays **12.** Two different species of animals live in the same area of a park and eat the same food to survive. Which term describes the relationship between these two species of animals? **A.** Competition **B.** Conservation **C.** Regulation **D.** Succession **13.** Polar bears live in the Northern Hemisphere and need a large amount of Arctic ice to hunt. Which of the following is most likely to occur if the amount of Arctic ice in polar regions decreases significantly over a short period of time? Polar bears will - **A.** migrate south **B.** develop a larger body size **C.** become extinct **D.** adapt to water environments **14.** Three birds are represented in the drawings below.  Studying the beak of each of these birds would best help a scientist understand - **A.** how the birds fly **B.** where the birds live **C.** what the birds eat **D.** if the birds migrate **15.** **The picture shows a pond ecosystem.**            ✅ CRUN\_H00100B.1 Test Pond Ecosystem with Lily plants Export\_2024.08.08.07.21.39.330.04.00 Observe the image of the pond ecosystem. Which of the following statements is true? **A.** The abiotic factors in this ecosystem include the water, fish, lily plants, and turtle. **B.** This ecosystem includes multiple types of producers and multiple types of consumers. **C.** It is likely that the organisms in this ecosystem do not interact with each other. **D.** This ecosystem includes one population of organisms. **16.** Directions: Click the box to select each correct answer. You must select three correct answers.  Observe the image of the desert ecosystem. The organisms living in this ecosystem have - **A.** adaptations allowing them to survive in any type of ecosystem **B.** adaptations to support survival in a dry climate **C.** behaviors that enable them to survive in the ecosystem **D.** physical characteristics to help them survive **17.** Read the diagram. Which statement about nitrogen is false? **A.** Nitrogen is transferred to decomposers through only 1 path. **B.** Nitrogen flows through living things and the atmosphere. **C.** Nitrogen cycle processes continuously repeat. **D.** Nitrogen is found in many forms within the nitrogen cycle. **18.** Directions: Click the box to select each correct answer. You must select all correct answers. Which of the following statements are true about the flow of matter through an ecosystem? **A.** Nitrogen can exist within biotic and abiotic components of an ecosystem. **B.** Photosynthesis is a main process of the carbon cycle. **C.** The water cycle begins with evaporation and ends with runoff. **D.** Water, carbon, and nitrogen flow through all levels of a food web. **19.** Read the graph.  The snowshoe hare is an important source of food for the lynx. What conclusion can be made about their population fluctuations? **A.** Both populations gradually decreased from 1850 to 1925. **B.** The predator-prey relationship often causes the snowshoe hare population to decrease as the lynx population increases. **C.** The predator-prey relationship is likely the only factor that caused population fluctuations from 1850 to 1925. **D.** There is no clear relationship between the snowshoe hare population and lynx population. **20.** Directions: Drag the answers to the correct boxes. Match the correct relationship to each set of organisms. ------------------------ -- ------------------------ -- ------------------------    ------------------------ -- ------------------------ -- ------------------------  **You have reached the end of this section.**