Science STAAR Release 2021 part 1

Immediately after a forest fire, the primary consumers in the area will compete most for which biotic factor?

• food

• space

• oxygen

• sunlight

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

• Because of friction, the ball continues rolling forward at the same speed.

• Because of friction, the ball rolls forward at an increased speed.

• Because of inertia, the ball continues rolling forward at the same speed.

• Because of inertia, the ball rolls forward at an increased speed.

Tags

NGSS.MS-PS2-1

• There is a change in shape.

• There is a change in volume.

• The two liquids mix into a solution.

• The two liquids form a new substance.

Tags

NGSS.MS-PS1-2

• It is August in the Northern Hemisphere. It is April in the Southern Hemisphere.

• It is summer in the Northern Hemisphere. It is winter in the Southern Hemisphere.

• The number of hours of daylight is greater in the Southern Hemisphere than in the Northern Hemisphere.

• Spring begins earlier in the year in the Southern Hemisphere than it does in the Northern Hemisphere.

Tags

NGSS.MS-ESS1-1

NGSS.MS-ESS2-6

Tiny organisms called Daphnia live in lakes and ponds where they consume algae. A lake with a stable population of algae and Daphnia was contaminated by pollution, resulting in the death of many algae. Which graph shows the most likely trend in the Daphnia population in the lake shortly before and after the pollution event?

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Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

A student pushes a 51.5 kilogram bookshelf across a smooth floor with a net force of 67 N. What is the approximate acceleration of the bookshelf?

• 1.3 m/s²

• 3,450.5 m/s²

• 15.5 m/s²

• 0.77 m/s²

Tags

NGSS.MS-PS2-2

• cross a canyon with a river running through it

• cross another peak in the park

• be flat and then go up a steep slope

• go down a steep slope and then become flatter

Which pair of elements are nonmetals and gases at room temperature and normal atmospheric pressure?

• Fluorine, F, and chlorine, Cl

• Boron, B, and aluminum, Al

• Hydrogen, H, and cesium, Cs

• Cobalt, Co, and nickel, Ni

A farmer digs a small pond in a pasture. The farmer adds young individuals from two species of algae-eating fish to the pond and plants some reeds around the edges of the pond. The farmer wants the pond to be a sustainable ecosystem. Which of the following would be most helpful in increasing the pond ecosystem’s sustainability?

• Decreasing the number of plant species around the edges of the pond

• Introducing older fish of the same species into the population of algae-eating fish

• Having a greater diversity of living organisms in the pond

• Adding gravel between the water and where the reeds are planted

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS2-5

• The vehicle was traveling at a constant speed.

• The vehicle was accelerating at a constant rate.

• The speed of the vehicle was increasing.

• The acceleration of the vehicle was increasing.

Tags

NGSS.MS-PS3-1