Science STAAR

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

Students mixed two liquids in a beaker and listed their observations. Based on these observations, which statement contains the best evidence that a chemical reaction occurred?

• 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

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-LS2-4

A topographic map provides details about Emory Peak in Big Bend National Park. A radio tower on Emory Peak is indicated. Based on the topographic map, if a park ranger hiked due west from the radio tower, the ranger’s path would —

• 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

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-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS2-5

Students view two different cells under a microscope. They record their observations in the table shown. Based on the organelles observed, the students determine that cell 2 is a plant cell because it has an organelle that —

• allows water to enter and exit the cell

• contains genetic information

• stores water and nutrients

• produces its own food

Tags

NGSS.MS-LS1-2

Students recorded the dates in May on which they observed a full moon and a last quarter moon. On which date will they most likely be able to observe a new moon?

• May 13

• May 18

• May 25

• May 31

Tags

NGSS.MS-ESS1-1

The names and chemical formulas of four substances are shown in the chart. Which substance listed in the chart is made up of the most atoms?

• Carbonic acid

• Nitric acid

• Phosphoric acid

• Sulfuric acid

Tags

NGSS.MS-PS1-1

A student measures the mass and volume of a small cube made of an unknown metal. The mass of the cube is 25.0 g, and the volume of the cube is 3.19 cm3 . The student is told that the cube is a sample of one of the four metals listed in the table. Based on the data given, the unknown metal is most likely —

• gold

• iron

• silver

• tin

Tags

NGSS.MS-PS1-2

Students create a table that lists processes observed in nature. Which process describes only a physical change?

• Process 1

• Process 2

• Process 3

• Process 4

Tags

NGSS.MS-ESS2-4