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STAAR Grade 8 Science

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Last updated about 1 year ago
40 questions
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Question 1
1.

A food web is shown.

What is the total number of organisms that eat primary consumers?

Question 2
2.

A topographic map is shown.


Based on the topographic map, if all four areas receive the same amount of rainfall, which area would MOST LIKELY experience the greatest rate of erosion?

Question 3
3.

A student bounces a basketball off the gym floor.

Which statement correctly describes the action-reaction force pair that causes the ball to bounce?

Question 4
4.

Matter can undergo physical or chemical changes. Which of these are examples of physical changes?

Select TWO correct answers.

Question 5
5.

The model shows the position of Earth in its orbit around the sun and two points on Earth.


Which statement correctly compares and explains the length of daylight at the two points?

Question 6
6.
What are the charge AND location of each subatomic particle of an atom?

Move the correct answer to each box in the table. Each answer may be used more than once.
Other Answer Choices:
Nucleus
Energy levels
0
+1
-1
Question 7
7.

The diagram shows positions of the moon as it orbits Earth.


At which position will a waning crescent moon be seen from Earth?

Question 8
8.

Which TWO body systems are MOST DIRECTLY responsible for students being able to reel rain on their skin?

Identify the body systems AND explain how these systems are responsible for creating a sensation on skin.

Enter your answers in the box provided.

Question 9
9.

A scientist is working with an element that is a gas at room temperature and does not react with other elements.

Which characteristic BEST describes this element?

Question 10
10.

The table shows the percentages of crops pollinated by honeybees in the United States.


Over the past 30 years, honeybee populations in the United States have decreased significantly.

Which statement describes the MOST LIKELY long-term effect of a continuing decrease in honeybee populations?

Question 11
11.

Which graph represents a baseball player accelerating away from a base located on the origin?

Question 12
12.

Which statement correctly describes characteristics of organisms in a particular kingdom?

Question 13
13.

Ocean water absorbs carbon dioxide from the atmosphere. Carbon dioxide lowers the pH of the ocean water, which is harmful to organisms living in the ocean.

Which activity is most likely to decrease the amount of carbon dioxide being added to the ocean water?

Question 14
14.

A group of students was conducting an investigation with plants. One group of plants was placed inside a closet. The other group of plants was placed next to a window. After two weeks, the plants next to the window were taller and healthier than the plants in the closet.

Which statement BEST explains the difference in plant growth?

This question has two parts.

A student lists two land features:
  • Himalayas (mountain range)
  • (East African) Great Rift Valley
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Question 17
17.

A student is pushing two blocks on a smooth, frictionless surface.


What force is required in order to produce an acceleration of 2.5 m/s2?

Question 18
18.

Which statement BEST compares the atoms of two elements that have similar chemical properties?

Question 19
19.

How do fossil records support the theory of plate tectonics?

Question 20
20.

Question 21
21.

A student examines the organism shown and uses the dichotomous key to identify it.



Based on the dichotomous key, which organism is shown?

Question 22
22.

Salt cedar trees are small invasive trees that cause environmental problems in Texas watersheds. Some of the characteristics of salt cedar trees are listed.


Which statement describes the most likely long-term environmental impact of the salt cedar trees?

This question has two parts.

The mass, applied force, and frictional force for four carts are shown in the table.

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SCI.8.6c
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Question 25
25.

Most calendar years contain 365 days. What is the number of new moons that can occur in calendar years with 365 days?

Question 26
26.

An energy pyramid is shown.


Which statement BEST describes the flow of energy through this pyramid?

Question 27
27.

A neutral atom has an atomic mass of 16 amu. Which particles contribute the MOST to the atomic mass of this atom?

Question 28
28.

The chemical formula for methane is CH4.

Which statement describes the atoms present in FOUR molecules of methane?

Question 29
29.

The diagram shows the alignment of Earth, the moon, and the sun on one day in May 2019.


The table shows tide heights for a coastal city on four different days in May 2019.


Based on the table, on which data were Earth, the moon, and the sun MOST LIKELY arranged as shown in the diagram?

Question 30
30.

A graph of an object's motion during a 5-second time interval is shown.


Which statement correctly compares the object's motion during the first 3 seconds and the last 2 seconds?

Question 31
31.

Students listed characteristics of some cells they had studied. Identify the characteristics that are part of the cell theory.

Select TWO correct answers.

Question 32
32.

The diagram shows different types of tectonic plate boundaries.


Which table accurately shows the surface features associated with each tectonic plate boundary?

Question 33
33.

Which statement BEST compares the properties of silicon (Si) and nickel (Ni)?

Question 34
34.

There are many different species of rate snakes in the United States. Three species are described in the table.


These species are similar but have different color patterns.

Which statement BEST explains these differences in color?

Question 35
35.

An equation for a chemical reaction is shown.

NaOH + HCl \longrightarrow NaCl + H2O

Which statement provides evidence that mass is conserved in the reaction?

Question 36
36.

The diagram shows Earth at different positions as it orbits the sun.


What differences between Earth's Northern and Southern Hemispheres are represented in the diagram, AND what causes these differences?

Look at the diagram and read the question carefully. Then enter your answers in the box provided.

Question 37
37.

A food web is shown.


Based on the food web, which types of organisms would the grasshopper mouse most likely compete with for food sources?

Question 38
38.
The diagram shows two arrows that represent the directions of two forces acting on a 1-kilogram ball. The arrows do not represent amounts of force, they only represent the directions of the two forces.

How should the diagram be labeled if the ball is accelerating to the west at a rate of 1 m/s2?

Move the correct answer to each box. Not all answers will be used.
Other Answer Choices:
5 newtons
10 newtons
12 newtons
8 newtons
7 newtons
Question 39
39.

The image shows a roller coaster cart moving along a track.


Which statement BEST describes the kinetic and potential energies of the cart at Location X compared with the kinetic and potential energies of the cart at Location Y?

Question 40
40.

A neutral atom of which element has 12 protons?

Eight
Area Z
The gym floor pushes up on the ball with a greater amount of force than gravity pulls down on the ball.
Breaking an egg
Cooking an egg
Freezing a popsicle
Rusting iron
The length of daylight is longer at Point X than at Point Y because the Norther Hemisphere is tilted away from the sun.
The length of daylight is longer at Point X than at Point Y because the Norther Hemisphere is tilted toward the sun.
Z
Almonds will be in danger of becoming extinct.
Other insects will begin pollinating the crops that rely on honeybees.
The plants next to the window were able to convert more light energy into electrical energy.
Question 15
15.

Part A
Which statement describes how each land feature MOST LIKELY formed?

Question 16
16.

Part B
Which statement BEST explains the correct answer to Part A?

75 N
Some characteristics of several astronomical objects are listed. Identify each object based on the characteristic listed.

A characteristic may have more than one correct object.
Star
Nebula
Comet
Meteor
Contains a center of dust and ice
Rock that vaporizes as it falls through Earth's atmosphere
Sphere of plasma that produces its own light
Has a tail of gas and dust particles
Cloudlike formation of gas and dust
Peranema
Chilomonas
The populations of native plants will decrease.
Question 23
23.

Part A
Based on the data table, which cart has the lowest acceleration?

Question 24
24.

Part B
Which statement BEST explains the correct answer to Part A?

Secondary consumers represent the most organisms, and they have the greatest amount of energy in their trophic level.
Tertiary consumers do not receive all the energy from the trophic level below them, because some energy is lost to the environment.
Four molecules of methane would contain 16 atoms of carbon and 16 atoms of hydrogen.
May 18
May 22
May 26
The velocity changes, but the speed stays the same.
Each individual snake changed its color to match its environment.
Each individual snake chose the best colors to pass to its offspring.
One chlorine atoms pairs with one sodium atom in the products, and one chlorine atoms pairs with one hydrogen atom in the reactants.
Herbivores and decomposers
The cart has the same amounts potential energy and kinetic energy at Location X as it has at Location Y.
The cart has more potential energy and kinetic energy at Location X than it has at Location Y.
Tectonic plates are moving toward each other in area that form mountains, while tectonic plates are moving away from each other in areas that form rift valleys.