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WorksheetsSTAAR (2018)
Total questions: 42
Worksheet time: 4hrs 30mins
Which of the following best describes a relationship in this grassland?
Badgers are top predators because they eat upland sandpipers and beetles.
A producer–consumer relationship exists between lupines and ants.
A predator–prey relationship exists between beetles and ground squirrels.
Upland sandpipers are primary and secondary consumers because they eat grasses and grasshoppers.
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.
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
Some of the chemical energy in the natural gas transforms into thermal energy, which heats the water. Then some of the thermal energy changes into sound energy when the water forms steam and the steam leaves the kettle.
Some of the thermal energy in the natural gas transforms into sound energy when the water becomes hot. Then some of the sound energy changes into light energy when the kettle becomes warm.
Some of the electrical energy in the natural gas transforms into thermal energy, which causes the water to form steam. Then some of the thermal energy changes into sound energy and light energy when the steam leaves the kettle.
Some of the light energy in the natural gas transforms into chemical energy in the water. Then some of the chemical energy changes into kinetic energy when steam leaves the kettle and into sound energy when the water boils
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
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.
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
In Situation 1, no work was done, while 12,000 J of work was done in Situation 2.
In Situation 1, 1,600 J of work was done, while 3,000 J of work was done in Situation 2.
In Situation 1, no work was done, while 8,000 J of work was done in Situation 2.
In Situation 1, 400 J of work was done, while 1,300 J of work was done in Situation 2.
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
How many valence electrons are in an atom of each element in Group 15 in the periodic table?
6
8
5
30.974
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.
Pine trees in a dense forest can grow taller than pine trees in an open meadow.
Pine trees in a dense forest compete for sunlight with the surrounding trees.
Pine trees in a dense forest are part of a less-complex food web than pine trees in an open meadow.
Pine trees in a dense forest have more living branches than pine trees in an open meadow.
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
Neon, because it has two energy levels with eight electrons in the second level
Chlorine, because it has three energy levels with seven electrons in the third level
Gallium, because it has four energy levels with three electrons in the fourth level
Tin, because it has five energy levels with four electrons in the fifth level
Barnard’s Star
Wolf 359
Sirius A
Ross 248
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.
Which statement accurately describes the atoms of a specific element?
An indium‚ In‚ atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.
A scandium‚ Sc‚ atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.
An aluminum‚ Al‚ atom contains 27 electrons and 27 protons inside the nucleus.
A zinc‚ Zn‚ atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.
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.
Location W
Location X
Location Y
Location Z
Which chemical reaction involves the fewest oxygen atoms?
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.
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.
Sulfur hexafluoride, SF6, is a very stable, nonflammable gas at room temperature. It is used in many electronic products because it is a good electrical insulator.
SF6 is a compound containing atoms of sulfur and fluorine.
SF6 is a compound that contains seven identical atoms.
SF6 is an element with sulfur in the atom’s nucleus and fluorine outside the nucleus.
SF6 is an organic compound composed of long chains of sulfur atoms surrounded by fluorine atoms.
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?
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.
Cold temperatures in the North favored the survival of populations of larger sparrows over populations of smaller sparrows.
High elevations in the West provided a survival advantage for populations of larger sparrows over populations of smaller sparrows.
Warm temperatures in the South allowed populations of larger sparrows to survive over populations of smaller sparrows.
Coastal environments in the East tended to give a survival advantage to populations of larger sparrows over populations of smaller sparrows.
Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the periodic table and then classified each element as a metal, a nonmetal, or a metalloid. Which table was completed correctly?
2.25
2.77
0.36
None of the above
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
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.
Another force in the direction of the motion produced a lower acceleration than calculated.
An opposing force caused by friction produced a lower acceleration than calculated.
Another force in the direction of the motion produced a higher acceleration than calculated.
An opposing force caused by friction produced a higher acceleration than calculated.
Wheat was one of the first plant crops that humans domesticated. In the process of domestication, the wild form of wheat was eventually changed into a form more suited to human agricultural practice.
Early farmers most likely used seeds only from wheat plants with —
larger grains that could produce more food per plant
taller stems that could block sunlight from weeds growing at ground level
larger flowers that could be sold for additional income
thinner stems that could endure heavy winds
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.
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
