Download Science 7 Final Test Key.p65

SCIENCE 7
FINAL TEST ANSWER KEY
Part A: True or False (9 marks)
1. F
2. T
3. F
(9 marks)
4. F
5. F
6. F
7. F
8. F
9. T
Part B: Fill in the Blanks (9 marks)
1. Mary uses resources no faster than they are being replaced. She is living a(n) sustainable lifestyle. (1 mark)
2. A mineral property that describes the tendency to break along smooth, flat surfaces is cleavage. (1 mark)
3. A(n) taproot is an underground adaptation found in many plants that live in areas where there is little water
near the surface of the soil. (1 mark)
4. Packing your sandwich in a plastic box that you wash when you get home is an example of re-using. (1 mark)
5. The major internal stress in the cables of a suspension bridge is due to tension. (1 mark)
6. Sandy soil contains mostly parent matter. (1 mark)
7. You turn on a flashlight. Stored chemical energy is used to produce electricity. (1 mark)
8. The handle of a frying pan should be made from a material that is a good insulator. (1 mark)
9. One crustal plate moves horizontally past another at a transform fault. (1 mark)
Part C: Matching (10 marks)
1. C
2. G
(10 marks)
3. D
4. K
5. F
6. M
7. H
8. P
9. L
10. J
10. B
11. C
12. C
13. B
14. D
15. B
Part D: Multiple Choice (18 marks)
1. C
2. C
3. B
(18 marks)
Science 7
4. A
5. B
6. D
7. D
8. A
9. C
1
16. A
17. A
18. D
Final Test Answer Key
Part E: Short Answers (43 marks)
1.
A
C
highest
2.
gas
B
(1 mark)
lowest
plateau
liquid
start
plateau
solid
(1 mark)
finish
3. Answers will vary. Arguments against draining the wetland might include the following:
• Wetlands are unique ecosystems. Some organisms that live in wetlands cannot live anywhere else.
Therefore, draining the wetland would remove their habitat.
• Wetlands act as natural water filters. Removing wetlands removes this natural filtration system.
• Wetlands act as natural sponges, absorbing run-off, storing water, and returning it to the water table.
Draining the wetland would remove this sponge.
• Wetlands provide a unique habitat for migratory waterfowl. Removing the wetland means that this
habitat is no longer available for these birds as they travel north or south.
(2 marks)
4. a. Volcanoes occur at the boundaries between tectonic plates. (1 mark)
b. It is thought that convection currents in Earth’s mantle provide the mechanism that moves the tectonic
plates. (1 mark)
5. They bioaccumulate in the tissues of an organism’s body. Their concentration increases as they are passed up
the food chain or food web. (2 marks)
6. Plants clean the air and water, provide shelter, and are producers. Their roots also keep soil in place. (3 marks)
7. Answers will vary. Plants may have
• a sweet nectar to attract insects
• bright flowers
• tall stigma to trap pollen blown in the wind
• a specific flower structure adapted to certain pollinator structures (long beaks)
• tall anthers to allow wind pollination
• pollination time correlated with the pollinators’ life cycle
• physical placement of male and female parts to allow self-pollination
(2 marks)
8. The beam should be placed on the narrower edge. It has greater tensile and compression strength due to more
material supporting the load. (2 marks)
9. Accept any device as long as there is a suitable reason. (1 mark)
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Final Test Answer Key
10. a. The weight of an astronaut decreases as the distance from Earth increases. (1 mark)
b. The astronaut’s mass on Earth was 68 kg. (1 mark)
Note to teacher: Accept the more accurate 69.3 kg as well.
c. The astronaut’s mass would not change. (1 mark)
11. Any four of the following should be considered:
• function
• materials
• joints
• cost
• aesthetics
• safety
• environmental impact
(2 marks)
12. Treads on the sole of running shoes increase friction. (1 mark)
13. a. The Atlantic Ocean is widening more slowly. The magnetic bands are narrower than those on the Pacific
Ocean. (2 marks)
b. They would be mirror images. The plates move apart, with material filling the gap in about equal
amounts on both sides of the gap. (3 marks)
14. The particles of the substance absorb energy from the surface they are on. They move faster, hit harder, and
move farther apart. Once the particles gain enough energy to break away from the attraction of the other
particles, they escape, thus changing state and removing energy. This loss of energy cools the object.
(5 marks)
15. a. 4, 3, 2, 1, 5 (1 mark)
b. the principle of superposition (1 mark)
c. At A, there is sedimentary rock. At B, there is metamorphic rock. At 5, there is igneous intrusive rock.
(3 marks)
16. a. selective breeding/artificial selection and genetic engineering/modification (not sexual reproduction)
(2 marks)
b. cuttings, grafting, layering, runners, suckering (not cloning) (2 marks)
Note to teacher: By itself, vegetative/asexual reproduction is worth 1 mark. It is worth nothing
when combined with other answers.
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Final Test Answer Key
17. Answers will vary. Accept any reasonable controlled variable as long as the explanation is compelling.
(2 marks)
Part F: Long Answer (11 marks)
1. Tables will vary. A sample table is given.
Environment Assessment of Local Watershed
Total Number of Amphibians
Site
Day 1
Day 2
Day 3
Average
Rating
(1 being the best,
4 being the worst)
1.
2.
3.
4.
(8 marks)
Note to teacher: The following is a suggested marking guide:
Specific title
Appropriate headings
Appropriate columns for data placement
Neatness
TOTAL
1 mark
3 marks
3 marks
1 mark
8 marks
2. permanent plots (1 mark)
3. baseline data (1 mark)
4. bioindicators, biological indicators, or indicator species (1 mark)
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Final Test Answer Key