Population Questions. 1. Which of the following conditions is most likely to lead to an increase in a field mouse population?

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1 Biology II Ms. Chen Name: Date: Population Questions 1. Which of the following conditions is most likely to lead to an increase in a field mouse population? A. the arrival of another herbivorous mammal B. the presence of a greater number of predator snakes C. the disappearance of a bird species that preys on the mouse D. the lack of adequate rainfall for plants in the mouse s habitat 2. A population of flat-tailed horned lizards was found in a geographically isolated area. In 2002, the size of the population was about 25,500. In 2004, the size of the population was about 32,800. Which of the following statements explains the change in the size of the lizard population from 2002 to 2004? A. The birth rate was greater than the death rate. B. The emigration rate was greater than the birth rate. C. The death rate was greater than the immigration rate. D. The emigration rate was greater than the immigration rate. 3. In some areas, nuts from trees are an important source of food for grizzly bears. Female bears eat the nuts to gain weight before they give birth to their cubs. Based on this information, which of the following would most likely decrease the size of grizzly bear populations? A. insect pests attacking the trees B. birds building nests in the trees C. climate conditions spreading tree pollen D. soil conditions causing rapid tree growth 4. Which of the following is the best example of immigration in a population? A. Individuals in an algae population survive, grow, and reproduce during the warm summer months. B. Females in a brown bear population give birth to their cubs in winter and come out of their dens in spring. C. A large butterfly population lives in one area of southwestern England because the plant it feeds upon is located there. D. A ring-necked pheasant population in Washington increases in size due to the arrival of more pheasants from another state.

2 5. Plants and animals play major roles in cycling materials in ecosystems. The diagram below represents one particular cycle. Letters W and Y represent different processes. Letters X and Z represent different gasses. Which of the following statements correctly identifies part of this cycle? A. Letter W represents cellular respiration. B. Letter X represents oxygen gas. C. Letter Y represents transpiration. D. Letter Z represents nitrogen gas. 6. The graph below shows changes in the size of a mammal population in the early 1900s. Which of the following explanations is the most likely reason for the dramatic population change between 1915 and 1925? A. a decrease in the birth rate of the mammal population B. an increase in the death rate of the mammal population C. a large decrease in the number of the mammal s predators D. a large increase in snowfall for several months in the mammal s habitat

3 Open Response

4 One pond-dwelling species not shown in the illustration is Eurasian watermilfoil. Eurasian watermilfoil is an invasive plant species in the pond. It grows quickly and forms extremely dense mats in the water. None of the consumers included in the food web eat Eurasian watermilfoil. The table below shows the changes in the population density of two pond species since the appearance of Eurasian watermilfoil. Species Density before Eurasian Watermilfoil Appeared (number per square meter) Density Two Years after Eurasian Watermilfoil Appeared (number per square meter) water lily pondweed a. Based on the data in the table, describe what has happened to the water lily and pondweed populations since the appearance of Eurasian watermilfoil in the pond ecosystem. b. Explain two ways that the Eurasian watermilfoil could have caused these changes in the water lily and pondweed populations. c. Identify one primary consumer and one secondary consumer in the illustration. For each organism you identified, describe and explain the likely effect of the presence of Eurasian watermilfoil on the population. Be specific in your response.

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