HSA Biology Public Release 2005 - mdk12

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Session 1 13 BCR There are approximately 14 species of bay grasses in Chesapeake Bay. Bay grasses provide a habitat for birds, fish, and shellfish. Most bay grasses grow attached to the bottom substrate in shallow water. Scientists estimate that the area covered by bay grasses once exceeded 600,000 acres. In 1978, scientists learned that bay grasses only covered 41,000 acres. Scientists began working to improve environmental conditions in the bay. They replanted bay grasses in some areas. They set a goal of having 110,000 acres of bay grasses by the year 2000. The data collected from yearly surveys of bay grasses is shown in the graph below. Acres of Bay Grass 120,000 100,000 80,000 60,000 40,000 20,000 BAY GRASS COVERAGE IN CHESAPEAKE BAY (1984–2000) NO DATA Goal 0 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 Year Evaluate the success of this project. In your response, be sure to • predict the most likely value for the missing data in 1988; explain your answer • describe the trend in the area covered by bay grasses in Chesapeake Bay from 1984 to 2000; use specific information from the graph to support your answer • suggest possible reasons for the changes in the graph between 1993 and 1995 • describe ways that individuals can help in the restoration of bay grasses Write your answer in your Answer Book. Biology Public Release 2005 Page 10 Copyright © 2005 by Maryland State Department of Education.
Session 1 D irections Use the information and the graph below to answer Numbers 14 and 15. A group of students studied the effect of light intensity on the rate of a cell process in Elodea plants. The students exposed Elodea plants to different light intensities. A gas was produced by the cell process. The amount of this gas was measured. The rate of the cell process was determined by the amount of gas produced. A graph of the students’ measurements is shown below. THE EFFECT OF LIGHT INTENSITY ON A CELL PROCESS IN ELODEA PLANTS Rate of Cell Process Light Intensity ■14 Which of these is the independent variable in this experiment? F G H J rate of cell process volume of gas size of Elodea plant intensity of light ■15 Which of these parts of the Elodea plant cell produces the gas measured in the experiment? A B C D mitochondrion chloroplast ribosome nucleus Biology Public Release 2005 Page 11 Copyright © 2005 by Maryland State Department of Education.
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Page 17 and 18: Session 1 ■21 Which of these orga
Page 19 and 20: Session 1 D irections Use the infor
Page 21 and 22: Session 1 ■27 Hemoglobin is an im
Page 23 and 24: Session 2 Biology Public Release 20
Page 25 and 26: Session 2 ■33 Cells in the stomac
Page 27 and 28: Session 2 ■34 Hydrothermal vent c
Page 29 and 30: Session 2 38 BCR Galactosemia is an
Page 31 and 32: Session 2 ■41 Which of these is p
Page 33 and 34: Session 2 ■42 Coyotes and gray wo
Page 35 and 36: Session 2 48 BCR Mammals are expose
Page 37 and 38: Session 2 ■53 A researcher recent

HSA Biology Public Release 2005 - mdk12

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