Countdpwn to Science STAAR 2.7 , 2.8 and 2.9

Many homeowners put solar panels on

the roofs of their houses. Solar panels use

energy from the Sun and convert it into

energy to power the house.

The energy from the sun is converted into -

• thermal energy

• mechanical energy

• electrical energy

• light energy

Below is a model of a river delta.

Why does a delta form when a river reaches a lake or ocean?

• Waves from the lake or ocean drop sediment along the

  mouth of the river as they crash into shore.

• Sediment is brought into the mouth of the river during high

  tide and it is left there during low tide.

• When water reaches the end of the river, it slows down and

  drops sediment at the mouth of the river.

• Through the process of erosion, the river cuts through the

  bedrock, creating many small valleys.

Tags

NGSS.MS-ESS2-2

The illustration shown here

represents the results of an

experiment performed by

some students.

Which physical property

determines whether an object

floats or sinks in a container of

water?

• Solubility

• Density

• Conductivity

• Physical state

Every morning the Sun rises in the east, moves across the sky and sets in the west.

Which event below best describes these observations of the Sun?

• The Sun rotates around the Earth.

• The Earth rotates around the Sun.

• The Earth rotates on its axis.

• The Moon rotates around the Earth.

Tags

NGSS.MS-ESS1-1

A partial food web of a marine ecosystem

is shown here. Which type of organism is represented by

the letter X?

• Consumer

• Producer

• Herbivore

• Decomposer

Tags

NGSS.MS-LS2-3

Decomposers, such as bacteria and

fungi, break down and consume dead

plants and animals.

Why are decomposers an important part of

the food chain?

• They get rid of dead plants and animals.

• They return important nutrients to the

  soil for plants.

• They release oxygen and carbon dioxide

  into the air.

• The make more room for new plants and

  animals.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

Paleontologists study the fossilized teeth of extinct species, including dinosaurs. The pictures below show the fossilized teeth of two different dinosaur species.

What can scientists conclude about the diet of the two different dinosaurs based on the shape of their teeth?

• Dinosaur A ate meat, while dinosaur B ate plants.

• Dinosaur B ate meat, while dinosaur A ate plants.

• Both dinosaurs ate the same diet of plants.

• No conclusion can be drawn.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

In science class, students are asked to predict and draw what will happen when the teacher pours oil and water together in one beaker.

Which drawing is correct?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-2

During science class, students were

asked to separate the following materials

into three groups: solid, liquid, or gas.

Using the table below, record how many

materials are in each group.

Which summary of the table is correct?

• 7 solids, 4 liquids, 2 gases

• 5 solids, 5 liquids, 2 gases

• 6 solids, 4 liquids, 2 gases

• 6 solids, 3 liquids, 3 gases

Which example below most accurately describes reflection of sunlight?

• Sunlight hits the surface of a pond and you can see fish swimming below the surface.

• The asphalt driveway burns your feet on a hot and sunny day.

• Sunlight easily passes through a car window and it is bright inside of the car.

• The surface of a lake is very bright and you need to wear sunglasses

Tags

NGSS.MS-PS4-2