Maria grew four plants in an experiment about plant growth. The table shows the design and results of Maria’s experiment. What was the independent variable in this investigation?

• the amount that each plant grew

• the amount of food each plant received

• the amount of water each plant received

• the amount of sunlight each plant received

Elaine wants to measure the volume of a large pitcher of lemonade. Which units should Elaine use?

• liters

• grams

• meters

• degrees

Which graph best represents the information in the table?

• 
• 
• 
• 

Miguel was conducting an experiment. He wrote the following sentences in his notebook:

• The starting temperature of the water was 10 degrees Celsius.

• An object weighing 5 grams was placed in the water.

• The temperature of the water increased to 15 degrees.

• The object must have been hotter than 10 degrees.

In which sentence did Miguel make an inference?

• sentence 1

• sentence 2

• sentence 3

• sentence 4

Which statement best explains how a microscope helps scientists?

• A microscope allows scientists to see things that are far away.

• A microscope allows scientists to see things that are very small.

• A microscope allows scientists to hear sounds that are far away.

• A microscope allows scientists to hear sounds that are very quiet.

How could Dwight improve his model?

• Make the Moon smaller than Earth.

• Use a flat object, such as a coin, for Earth.

• Place Earth between the Moon and the Sun.

• Place the Sun is between the Moon and Earth.

George will conduct a scientific experiment. In what order should George follow the steps?

• 1-3-2-4

• 4-3-2-1

• 3-2-4-1

• 2-1-4-3

DNA technology has improved greatly in the last twenty years. Which task has been made easier by the development of DNA technology?

• identifying genetic disorders

• determining the parts of an atom

• observing distant objects in space

• making very accurate measurements

Which statement best describes the part of the atom that is shown by the arrow?

• It is an electron, and it has a negative charge.

• It is an electron, and it has a positive charge.

• It is a proton, and it has a negative charge.

• It is a proton, and it has a positive charge.

Antonia is testing the properties of block A.

• She puts block A on top of a hot metal block and then touches the block A with her finger.

• She keeps her finger on the block A for several minutes, but block A still does not get hot.

What can Antonia conclude about block A?

• It is a good conductor.

• It is a poor conductor

• It is highly magnetic.

• It is nonmagnetic.