8th Grade Science Review

Which statement best describes the motion of the object plotted in the graph?

• The object accelerated because the distance traveled increased at a steady rate.

• The object traveled at a constant speed because of forces acting on the object.

• The object accelerated because it traveled in the same direction throughout the investigation.

• The object slowed down as it traveled uphill because of the forces acting on the object.

Which two pieces of data from the lab notebook show that matter is conserved in this investigation?

• Mass before is 471 g and mass after is 471 g

• Temperature before is 21.4 C and temperature after is 19.8 C

• Clear blue/light blue liquids before and blue liquid/dark blue solid precipitate after

A stream that runs into a lake cuts across a crop field. A new fertilizer is used in the field that has increased the nitrogen and phosphorus concentrations of the soil.

How will these increased nitrogen and phosphorus concentrations affect the ecosystem of the lake?

• increase shorbird nesting

• increase in algae population

• increase in fish population

• increase in oxygen concentration

The Punnett square will be used to display the results of a genetic cross between a heterozygous male and a homozygous recessive female. Complete the Punnett square.

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The picture shows a Dalmation dog. Which traits are inherited traits?

• Fur pattern

• Eye color

• Catching a ball

• Floppy ears

• Favorite treat

Identify the parts of the food chain that will most likely be negatively affected if insecticides are applied to producers? Select all your answers.

• Sun

• Grass

• Grasshopper

• Shrew

• Owl

A model of Earth, the Mon, and Sun is shown.

Which movement of the model displays an event that takes about 28 days?

• Earth rotates once on its axis.

• The Moon revolves once around the Sun.

• The Sun rotates once on its axis.

• The Moon revolves once around Earth.

Suppose a new type of plant is discovered with the following characteristics:

-Rapid reproduction

-Offspring genetically identical to parent

-New plant grows from root of existing plant

How does this type of plany most likely reproduce?

• asexual reproduction

• sexual reproduction

The picture shows students eating a picnic lunch. Choose all of the items that show a chemical change.

• ice melting in glass

• apple slices turning brown

• condensation on glass

• digesting food

The diagram shows the operational set up of a dry steam power plant and how energy is provided to residents.

Which energy transformation best applies to the dry stream power plant and the energy provided to residents?

• heat --> electrical --> mechanical

• heat --> mechanical --> electrial

• light --> electrical --> mechanical

• mechanical --> heat --> light