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Final Review 8th grade science 2020-2021 Flashcards | StudBud
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Final Review 8th grade science 2020-2021
Final Review 8th grade science 2020-2021
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Answers
1
A cold air mass moves underneath a warm air mass causing the warm air to rise. This event can best be identified as —
A cold front
a stationary front
A warm front
an occluded front
2
Which of these has been improved by genetic engineering?
Resistanceof corn plants to insects
Reduced number of pollinating insects
Growthof insects in cornfields
Visibilityof insects to predators
3
The physical expression of a trait in an organism is known as the —
phenotype
genotype
doublehelix
chromosome
4
Which facility relies on a nonrenewable source of energy?
A damthat uses the power of water
Asolar farm that collects sunlight
Apower station that burns coal
Awind farm that uses wind turbines
5
White-footed mice having thicker fur than cactus mice is probably influenced most by the differences in the —
environmentalclimates where they live
foodthat they eat
amountof predators they encounter
timeof day they are active
6
Which of these has the strongest gravitational field?
Earth
Jupiter
Saturn
Sun
7
Which of these represents the freezing point of water in correct SI units?
-273°C
0°F
0°C
32°F
8
Sea anemones are poisonous. However, the clownfish has developed an outer layer of mucus which provides protection from
A relationship
an energy requirement
Adaptation
A social hierarchy
9
Which of these properties of an unknown liquid can be found using a beaker, a hot plate, and a temperature probe?
Oxygen Level
Boiling Point
Density
Chemical composition
10
A girl kicks a soccer ball into the air. Which of these best explains why the soccer ball falls back to Earth?
Thepressure on the ball changes with altitude.
Themotion of the ball is changed by external forces.
Theforce exerted on the ball is greater than gravity.
Theacceleration of the ball is unstable.
11
A major scientific concern over nuclear energy is how
reduce the high levels of carbon dioxide emitted into the air
preventthe depletion of the ozone layer
storethe waste products safely
dealwith the large amounts of fossil fuels required
12
Which is an abiotic change in an ecosystem?
Fishspecies populations increase.
Plantphotosynthesis rates increase.
Annualrainfall totals for an area increase.
Aquaticpredator survival rates increase.
13
Which statement correctly describes a difference between the mesosphere and the stratosphere?
The mesosphere has more active weather than the stratosphere.
Themesosphere contains fewer oxygen molecules than the stratosphere.
Airpressure is lower in the stratosphere than in the mesosphere.
Temperaturesdecrease with altitude only in the stratosphere.
14
Which is the result of using a more powerful motor to run an elevator?
Thesame amount of time is needed to move the same distance.
Alonger time is needed to move a shorter distance.
Thesame amount of work is done in less time.
Lesswork is done in the same amount of time.
15
Sound waves are unable to travel through —
a vacuum
air
water
A rock
16
Which of these is a way that a person can help improve air quality?
Carpoolwith several people
Builda compost pile
Usea gas-powered lawn mower
Burnleaves in the fall
17
The shaded row in the table is called a —
a group
A column
A family
a period
18
Ca + 2H
2
O → Ca(OH)
2
+ H
2
How many different elements are involved in the chemical reaction shown?
4
2
10
3
19
As the frequency of a wave decreases, the wave's —
perioddecreases
speeddecreases
wavelengthincreases
amplitudeincreases
20
When comparing a plant cell to an animal cell, only the plant cell will contain —
mitochondria
chromosomes
chloroplasts
ribosomes
21
Which of these is the best description of a typical organism in the Plant kingdom?
Isunicellular
Makesits own food
Lacksa cell wall
Lacksa nucleus
22
Which characteristic is common to the four outer planets in our solar system?
Gaseouscomposition
Fastrevolution
Lowmass
Highdensity
23
Which action will most reduce the use of nonrenewable energy resources in a school district?
Installinglow-flow faucets and toilets
Recyclingworksheets and other paper products
Replacingcurrent lighting with more efficient lighting
Limitingthe sweeping and mopping of classrooms to once a month
24
Which of these is most likely the result of weasels and foxes depending on the same food source?
The populations will compete with each other.
Newspecies of prey will evolve in the area.
Birthratesfor both populations will increase.
Oneof the populations will become herbivores.
25
Which change will most likely increase the strength of a magnetic field produced by an electromagnet?
Reducethe number of turns of the coil
Removethe iron nail
Adda battery
Switchthe direction in which the battery is connected
26
A student recorded the temperature of an aquarium each hour for 8 hours. Which graph will best display the data?
Bar Graph
Circle Graph
Line Graph
Picture Graph
27
Why is water known as the "universal solvent"?
Itdissolves only solid substances.
It dissolves all known substances.
Itdissolves substances faster than all other solvents.
Itdissolves the greatest number of substances.
28
Which of these best completes the Conversion Table?
1 km = 1,000cm 1m = 100mm
1 km = 1,000mm 1m = 100cm
1 km = 1,000 m 1m = 100cm
1 km = 1,000m 1m = 100mm
