2019 STAAR TEST PLUS EXTRAS

The chart lists organisms in five different categories living near the Texas Gulf Coast

Based on the chart, which food chain best models a flow of energy in this ecosystem?

• Sun => Mosquitoes => Shrimp => Coyotes

• Sun => Algae => Shrimp => Red Drum

• Sun => Sunfish => Shrimp => Wood Ducks

• Sun => Willow Oaks => Algae => River Otters

A teacher asks students to make a model of a transform plate boundary. The students use blocks to represent tectonic plates and slide the blocks past each other in the directions of the arrows as shown.

Which event can the students best demonstrate with their model?

• Earthquake

• Volcano

• Rift Valley

• Mountain

Which statement best describes evidence that a chemical reaction occurs as a cake bakes?

• The water in the cake batter evaporates.

• The cake rises as gas bubbles form in the baking cake.

• The cake takes the shape of the container in which it is baked

• The water in the cake batter is used to keep the cake moist as it bakes.

The net force on a vehicle that is accelerating at a rate of 1.5 m/s2 is 1,800 newtons. What is the mass of the vehicle to the nearest kilogram? Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.

Mathematical Equivalence

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Wild hogs introduced to Texas from Europe became feral after the hogs escaped from the ranches where they lived. Feral hogs are omnivores that feed on native plants, crops, and small animals. Feral hogs can damage an ecosystem by rooting through the soil to look for food and trampling small plants.

Which types of native organisms do feral hogs most likely compete with for food sources?

• Carnivores and producers

• Herbivores and carnivores

• Producers and decomposers

• Decomposers and herbivores

A demonstration helps students understand a principle of roller coaster design

Which answer choice correctly describes the ball’s kinetic and potential energy?

• The ball has more potential energy at position X than at position Z

• The ball has more kinetic energy at position Y than at position W.

• The potential energy and kinetic energy of the ball are equal at position X.

• The potential energy and kinetic energy of the ball are greatest at position Z

The mass of an unidentified rock is 15.5 grams. Students determine the volume of the rock by placing the rock in a cylinder with water. The students calculate the density of the rock. They determine the identity of the rock based on the density ranges in the table.

The students most likely have which type of rock?

Density= Mass / Volume

• Coal

• Dolomite

• Peridotite

• Sandstone

Sodium and lithium have similar chemical properties. What characteristic of these elements explains why they are chemically similar?

• Their atoms both have one valence electron.

• Their atoms both have more neutrons than protons.

• Their atoms have the same number of energy levels.

• Their atoms contain equal numbers of protons and electrons

A student was given this partial dichotomous key and asked to determine in which of five orders the adult insect shown belongs.

Based on the dichotomous key, in which order does the insect belong?

• Diptera

• Isoptera

• Ephemeroptera

• Zoraptera

The diagram shows a model of an atom. The model contains three different subatomic particles. Particles X and Y are inside the nucleus, and particle Z is outside of the nucleus.

Which statements best describe the charges on the particles in this model?

• Both particles X and Y have a positive charge. Particle Z has a negative charge

• Both particles X and Y have a negative charge. Particle Z has a positive charge.

• Either particle X or particle Y has a positive charge. Particle Z has a negative charge.

• Either particle X or particle Y has a negative charge. Particle Z has a positive charge.