School Improvement in Maryland

Answer Key Science Grade 8 Public Release Items - 2009

MSA Item Number Answer Grade Objectives Assessed
1 D 8 4.D.2.b Use information gathered from investigations using indicators and the pH scale to classify materials as acidic, basic, or neutral.
/toolkit/vsc/assessment_items/msa_science_8_056.xml
2 A 8 2.D.2.b Identify and explain the relationship between the rotation of a planet or moon on its axis and the length of the solar day for that celestial object.
/toolkit/vsc/assessment_items/msa_science_6_058.xml
3 C 6 5.C.2.a Research and identify various energy sources and the energy transforming devices used to produce electrical energy
  • Wind (generators, wind mills)
  • Sun (solar cells)
  • Water (turbines)
  • Fossil fuels (engines)
/toolkit/vsc/assessment_items/msa_science_6_059.xml
4 D 6 5.C.2.b Cite examples that demonstrate the transformation of electrical energy into other forms of energy.
/toolkit/vsc/assessment_items/msa_science_6_060.xml
5 A 8 5.B.1.a Based on observable phenomena, identify and describe examples of heat being transferred through conduction and through convection.
/toolkit/vsc/assessment_items/msa_science_8_057.xml
6 A 8 1.A.1.a Explain that scientists differ greatly in what phenomena they study and how they go about their work.
/toolkit/vsc/assessment_items/msa_science_8_058.xml
7 B 6 2.C.1.c Identify and describe the Earth's crust.
  • The solid crust consists of separate plates
  • The plates constantly move in different directions due to convection currents
  • The plates interact with one another as a result of plate motion.
/toolkit/vsc/assessment_items/msa_science_6_061.xml
8 8 1.A.1.c Explain and provide examples that all hypotheses are valuable, even if they turn out not to be true, if they lead to fruitful investigations.
/toolkit/vsc/assessment_items/msa_science_8_059.xml
9 A 6 6.B.1.a Identify and describe a range of local issues that have an impact on people in other places.
/toolkit/vsc/assessment_items/msa_science_6_062.xml
10 A 6 6.B.1.b Recognize and describe how environmental change in one part of the world can have consequences for other parts of the world.
/toolkit/vsc/assessment_items/msa_science_6_063.xml
11 B 6 6.B.1.c Identify and describe that ecosystems can be impacted by human activities.
  • Protection of the Chesapeake Bay watershed
  • Resource acquisition and use
  • Land use decisions (agriculture, mining, and development)
  • Recycling
  • Use and disposal of toxic substances
/toolkit/vsc/assessment_items/msa_science_6_064.xml
12 A 8 6.B.1.b Identify and describe how human activities produce changes in natural processes:
  • Climate change
  • Loss of habitat due to construction
  • Hunting and fishing
  • Introduction of nonnative species
  • Cycling of matter
/toolkit/vsc/assessment_items/msa_science_8_060.xml
13 B 8 1.A.1.h Use mathematics to interpret and communicate data.
/toolkit/vsc/assessment_items/msa_science_8_061.xml
14 B 6 5.C.2.b Cite examples that demonstrate the transformation of electrical energy into other forms of energy.
/toolkit/vsc/assessment_items/msa_science_6_065.xml
15 8 4.C.1.b Describe what the temperature of a solid, or a liquid, or a gas reveals about the motion of its atoms and molecules.
/toolkit/vsc/assessment_items/msa_science_8_062.xml
16 C 7 3.E.1.c Investigate and describe the processes that enable plants to use the energy from light to make sugars (food) from carbon dioxide and water.
/toolkit/vsc/assessment_items/msa_science_7_019.xml
17 B 8 1.A.1.e Explain that if more than one variable changes at the same time in an investigation, the outcome of the investigation may not be clearly attributable to any one of the variables.
/toolkit/vsc/assessment_items/msa_science_8_063.xml
18 B 6 3.D.1.e Describe ways in which changes in environmental conditions can affect the survival of individual organisms and entire species.
/toolkit/vsc/assessment_items/msa_science_6_066.xml
19 A 6 5.D.1.a Cite examples to show that waves transfer energy from one place to another.
  • Light
  • Sound
  • Earthquake waves
/toolkit/vsc/assessment_items/msa_science_6_067.xml
20 A 8 2.B.2.b Recognize and explain that the fossil record of plants and animals describes changes in life forms over time.
/toolkit/vsc/assessment_items/msa_science_8_064.xml
21 D 8 2.B.1.b Cite evidence to confirm that thousands of layers of sedimentary rock reveal the long history of the changing surface of the Earth.
/toolkit/vsc/assessment_items/msa_science_8_065.xml
22 B 6 2.C.2.a Recognize and describe the evidence for plate movement.
  • Shape of continents
  • Continuity of geologic features and fossils on the continents
  • Ocean rifts, seafloor spreading
  • Global patterns of earthquakes and volcanoes
/toolkit/vsc/assessment_items/msa_science_6_068.xml
23 C 6 2.C.2.b Recognize and explain that major geologic events (earthquakes, volcanic activity, sea floor spreading) occur along crustal plate boundaries.
/toolkit/vsc/assessment_items/msa_science_6_069.xml
24 A 6 2.C.1.b Recognize and describe that the Earth's core
  • Is at the center of the Earth
  • Is very hot
  • Is dense and metallic
/toolkit/vsc/assessment_items/msa_science_6_070.xml
25 D 7 6.A.1.a Based on data identify and describe the positive and negative impacts of an increasing human population on the use of natural resources
/toolkit/vsc/assessment_items/msa_science_7_020.xml
26 D 7 3.B.1.d Collect data from investigations using single celled organisms, such as yeast or algae to explain that a single cell carries out all the basic life functions of a multicellular organism.
  • Reproducing
  • Extracting energy from food
  • Getting rid of wastes
/toolkit/vsc/assessment_items/msa_science_7_021.xml
27 A 8 1.B.1.a Verify the idea that there is no fixed set of steps all scientists follow, scientific investigations usually involve the collection of relevant evidence, the use of logical reasoning, and the application of imagination in devising hypotheses and explanations to make sense of the collected evidence.
/toolkit/vsc/assessment_items/msa_science_8_066.xml
28 7 3.E.1.c Investigate and describe the processes that enable plants to use the energy from light to make sugars (food) from carbon dioxide and water.
/toolkit/vsc/assessment_items/msa_science_7_022.xml
29 C 7 4.A.1.e Cite evidence to explain that all living and non-living things can be broken down into elements.
/toolkit/vsc/assessment_items/msa_science_7_023.xml
30 D 6 4.D.1.b Based on data gathered, identify and describe various processes used to separate mixtures.
  • Filtration
  • Evaporation
  • Paper Chromatography
/toolkit/vsc/assessment_items/msa_science_6_071.xml
31 A 8 4.A.1.c Based on data from investigations and research compare the properties of compounds with those of the elements from which they are made.
/toolkit/vsc/assessment_items/msa_science_8_067.xml
32 C 8 1.C.1.e Explain how different models can be used to represent the same thing. What kind of a model to use and how complex it should be depend on its purpose. Choosing a useful model is one of the instances in which intuition and creativity come into play in science, mathematics, and engineering
/toolkit/vsc/assessment_items/msa_science_8_068.xml
33 C 8 2.B.1.b Cite evidence to confirm that thousands of layers of sedimentary rock reveal the long history of the changing surface of the Earth.
/toolkit/vsc/assessment_items/msa_science_8_069.xml
34 A 8 6.B.1.a Based on data from research identify and describe how natural processes change the environment.
  • Cyclic climate change
  • Sedimentation in watersheds
  • Population cycles
  • Extinction
/toolkit/vsc/assessment_items/msa_science_8_070.xml
35 8 6.B.1.a Based on data from research identify and describe how natural processes change the environment.
  • Cyclic climate change
  • Sedimentation in watersheds
  • Population cycles
  • Extinction
/toolkit/vsc/assessment_items/msa_science_8_071.xml
36 B 8 2.E.1.b Recognize and describe the water cycle as the distribution and circulation of Earth's water through the glaciers, surface water, groundwater, oceans, and atmosphere.
/toolkit/vsc/assessment_items/msa_science_8_072.xml
37 C 6 5.C.2.a Research and identify various energy sources and the energy transforming devices used to produce electrical energy
  • Wind (generators, wind mills)
  • Sun (solar cells)
  • Water (turbines)
  • Fossil fuels (engines)
/toolkit/vsc/assessment_items/msa_science_6_072.xml
38 B 8 4.C.1.b Describe what the temperature of a solid, or a liquid, or a gas reveals about the motion of its atoms and molecules.
/toolkit/vsc/assessment_items/msa_science_8_073.xml
39 D 8 5.A.2.b Demonstrate and explain, through a variety of examples, that moving objects will stay in motion at the same speed and in the same direction unless acted on by an unbalanced force.
/toolkit/vsc/assessment_items/msa_science_8_074.xml
40 D 8 5.A.1.c Compare accelerated and constant motions using time, distance, and velocity.
/toolkit/vsc/assessment_items/msa_science_8_075.xml
41 A 8 1.A.1.h Use mathematics to interpret and communicate data.
/toolkit/vsc/assessment_items/msa_science_8_076.xml
42 D 7 3.B.1.c Based on research and examples from video technology explain that the repeated division of cells enables organisms to grow and make repairs.
/toolkit/vsc/assessment_items/msa_science_7_024.xml
43 D 6 3.D.1.c Explain that in any particular environment individual organisms with certain traits are more likely than others to survive and have offspring.
/toolkit/vsc/assessment_items/msa_science_6_073.xml
44 D 6 3.F.1.c Explain that within any environment organisms with similar needs may compete with one another for resources.
/toolkit/vsc/assessment_items/msa_science_6_074.xml