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Worksheets8th Grade Science STAAR Review
Total questions: 63
Worksheet time: 47mins
Which statement about stars is correct?
Star formation begins in a nebula.
White dwarfs become main-sequence stars when they gain mass.
Supergiants are stars that can absorb black holes.
Main-sequence stars are formed by comets.
Based on their observations, can the students correctly conclude that a chemical reaction occurred?
No, because the metal strip was still visible
Yes, because a new material of a different color formed on part of the metal strip
No, because the solution stayed blue
Yes, because the volume of the blue solution stayed the same
To fight a bacterial infection, a patient was given an antibiotic to take for 10 days. After the patient finished taking the antibiotics as directed, almost all the bacteria were killed. After another 10 days, the patient was sick again with the same type of infection.
What most likely happened?
A few bacteria survived the antibiotics and stopped reproducing.
The patient’s high fever inactivated the antibiotic, allowing the surviving bacteria to grow
rapidly.
The antibiotic slowed the life cycle of the bacteria.
Some of the bacteria were resistant to the antibiotic, and they reproduced.
A 1,100 kg car comes uniformly to a stop. If the vehicle is accelerating at - 1.2 m/s2, which force is closest to the net force acting on the vehicle?
-9,600 N
-1,300 N
-900 N
-94 N
Why does autumn start in different months of the year in North America and South America?
Earth’s orbit around the sun is not a perfect circle.
North America has a larger landmass than South America.
The moon has a greater pull on South America than on North America.
Earth’s axis has a 23.5° tilt.
What is the primary function of this body system?
The protection of vital organs from injury
The chemical breakdown of food into smaller pieces
The transport of nutrients, water, and oxygen to body cells
The production of hormones that regulate growth and metabolism
An ecosystem that is not sustainable can break down when a natural disaster occurs. This can lead to organisms in the ecosystem either leaving the area or dying off.
Increased biodiversity results in a more sustainable ecosystem because —
a greater number of plant species means that there is less barren land
a greater variety of species present allows more organisms to adapt after changes occur
the transition area between two ecosystems is narrower
there are fewer species to be affected by environmental stresses
Which statement describes the geologic process that is most likely responsible for the formation of these mountains?
They are along a transform plate boundary that is no longer active, so erosion is creating deep valleys.
They are along a transform plate boundary in which plates are currently moving side by side, causing earthquakes and faults.
They are along a plate boundary in which plates are currently converging, causing uplift and steep slopes.
They are along a plate boundary in which plates diverged in the distant past, allowing new rock to build up.
An action–reaction pair of forces exists between —
the aerialist’s feet and the rope
the rope and the balancing bar
the two ends of the rope
the aerialist’s arms and legs
Lions and cheetahs prey on wildebeests that graze in the grasslands of the African savanna. What likely effect would increased rainfall over several rainy seasons have on the populations of wildebeests, lions, and cheetahs?
All three populations would increase.
The wildebeest population would decrease, and the lion and cheetah populations would increase.
The wildebeest population would increase, and the lion and cheetah populations would decrease.
All three populations would decrease.
A student notices that the moon is full one evening. Which sequence of moon phases will the student observe over the next eight days?
Full, waning gibbous, third quarter
Full, waning gibbous, first quarter, waning crescent
Full, new, waning gibbous
Full, waxing gibbous, new, waning crescent
Which statement does NOT correctly compare silicon with another element?
Silicon is a better conductor of electricity than sulfur.
Silicon conducts electricity as well as copper does.
Silicon is a solid at room temperature, but argon is a gas.
Silicon is less malleable than silver.
At which location does the marble have maximum kinetic energy?
Location W
Location X
Location Y
Location Z
Which chemical reaction involves the fewest oxygen atoms?
2AgNO3 + K2SO4 ----------> Ag2SO4 + 2KNO3
4Fe + 6H2O+3O2 ------> 4Fe(OH)3
6CO + 6H2O ----------> C6H12O6+6O2 + 6O2
C2H4+3O2 ----------> 2CO2 + 2H2O
How are the convection currents in the student’s model different from the convection currents in Earth’s atmosphere and oceans?
The warm air in Earth’s atmosphere and the warm water in Earth’s oceans sink instead of rise.
The heat source for Earth’s atmosphere and oceans is the sun, which heats from above instead of below.
Convection cells in Earth’s atmosphere and oceans flow in the same direction instead of opposite directions.
Cold air in Earth’s atmosphere and cold water in Earth’s oceans are less dense than warm air and warm water instead of being more dense.
Based on the life-cycle information, which statement best describes the relationship between the nest fly larvae and the young birds?
The larvae are prey for the young birds.
The larvae are predators of the young birds.
The young birds are hosts for the larvae.
The young birds are consumers of the larvae.
Four boxes are sliding with constant speed before each box experiences an unbalanced force of 8 N. Which box would experience the greatest acceleration when the unbalanced force is applied?
The box with a mass of 2 kg
The box with a mass of 4 kg
The box with a mass of 6 kg
The box with a mass of 8 kg
A mid-ocean ridge is located at the boundary of two tectonic plates. Which diagram correctly models the relative plate motion on each side of a mid-ocean ridge?
A
B
C
D
Procedure 1: All the reactants were liquids that evaporated.
Procedure 2: A gas was formed as one product, and it escaped into the air.
Procedure 1: One of the reactants was converted to thermal energy. Procedure 2: All the products were liquids.
Procedure 1: The reactants were liquids with different densities. Procedure 2: The reactants were combined into only one product.
Procedure 1: One of the products was a gas that escaped into the air. Procedure 2: A gas from the air reacted with one of the other reactants.
Which picture shows how the moon appears from Earth when it is in the position shown in this model?
Waxing Gibbous
Waning Crescent
Waning Gibbous
Waxing Crescent
A
B
C
D
3.6
0.36
1.8
1.5
Some areas of an ocean are known as dead zones. These zones form when excess organic material decomposes. This increased decomposition uses up the oxygen from the water.
Which human activity is most affected by the increasing number of dead zones in the ocean?
Offshore oil drilling, because water in dead zones is toxic
Commercial fishing, because fish cannot survive without oxygen
Commercial shipping, because dead zones change the course of ocean currents
Sand mining, because oxygen is not available to form the sands on ocean beaches
Which area of the diagram represents the white dwarfs?
Area M
Area X
Area P
Area Z
Both the esophagus and the small intestine are involved in the digestion of food. The esophagus squeezes food into the stomach by wave-like muscle contractions. Peptidase enzymes in the small intestine break food molecules into smaller molecules.
Which statement best describes changes to food during digestion?
The muscle contractions result in physical changes, while the action of the peptidase results in chemical changes.
The muscle contractions and the action of the peptidase both result only in physical changes.
The muscle contractions result in chemical changes, while the action of the peptidase results in physical changes.
The muscle contractions and the action of the peptidase both result only in chemical changes.
Which sentence best describes how energy flows through this pyramid?
Energy is transferred down each level of the energy pyramid.
The energy lost at each level is consumed by organisms in the top level.
Energy is transferred from organisms in one level to those in the level above.
The organisms at the bottom level provide energy directly to organisms in all the other levels.
F
G
H
J
What keeps planets in the solar system from moving in straight lines through the galaxy?
Light energy
Gravity
Inertia
Potential energy
Whitetip reef sharks spend most of the day lying on the ocean floor. While remaining still, these sharks pump water across their gills.
The movement of water across their gills is necessary for —
staying cool
accessing food
obtaining oxygen
avoiding predators
The Northern Hemisphere experiences the beginning of spring when Earth is in-
Based on this diagram, which type of stars would belong to spectral class M and have the highest luminosity?
The rising magma that can result from this type of plate movement may produce-
A. Sun --> Mosquitoes --> Shrimp ---> Coyotes
B. Sun --> Algae ---> Shrimp --> Red drum
C. Sun ---> Pygmy sunfish --> Shrimp --> Wood ducks
D. Sun--> Williow oaks ---> Algae--> River otters
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