How are scientific theories different from scientific laws?

• Scientific theories are well-supported ideas that can be modified, but are rarely discarded.
• Scientific theories are laws that have not been proven yet.
• Scientific theories are claims that a few scientists believe.
• Scientific theories are educated guesses.

Which of the following statements is NOT one of the three parts of the Cell Theory.

• Cells are the basic unit of life.
• Cells come from other cells.
• All living things are made of cells.
• Cells make up nonliving objects.

Sarah conducted an experiment to determine whether salt added to a cup of water affects its boiling point. Water samples were prepared containing equal quantities of water at the same temperature. Each sample received a different amount of salt and was placed onto a heat source. The temperature of the water once it reached a rapid boil was recorded. Which conclusion correctly interprets the information from Sarah's table?

• Doubling the amount of salt doubled the boiling point.
• Increasing the amount of salt lowered the boiling point.
• Doubling the amount of salt decreased the boiling point.
• Increasing the amount of salt increased the boiling point.

Tags

NGSS.MS-PS1-2

If you were going to do an investigation using microscopes to investigate the similarities and differences between different types of cells, which of the following choices would be the BEST way for the students to collect data for this investigation?

• Make a bar graph based on the details you observe.
• Create a data table and make a line graph to determine any relationship.
• Poll classmates to see which type of cell is more popular, and then put the data into a chart.
• Make sketches and write down the name of each tissue sample and the magnification power used.

Tags

NGSS.MS-LS1-1

If you were going to design an experiment, which of the following would make your experimental data NOT  valid?

• Using the same procedure each time you perform the experiment.
• Making sure to control all variables that could affect the experiment.
• Changing more than one independent variable.
• Accurately recording the dependent variable.

Tags

NGSS.MS-PS2-2

Two students are going to run a mile and measure their heart rate before and after their run. Student A is very athletic and is a part of the school's undefeated track team. Student B enjoys going home after school to play video games all night and is not physically fit. According to the data from the chart, how does a person's physical fitness change the way the circulatory system responds to exercise?

• After running, the heart rate will increase by about 60 beats per minute.
• After running the heart rate will increase by about 80 beats per minute.
• The more physically fit a person is, the less the heart rate will increase after exercise.
• The more physically fit a person is, the more the heart rate will increase after exercise.

Tags

NGSS.HS-LS1-3

A student places three identical plants in the same type of containers, uses the same type of soil and the same amount of water for each plant. This student places the three plants in three different locations. Plant A is placed in a sunny area, Plant B is placed in a shaded location, and Plant C is placed in the dark room. Each day this student records the growth of each plant. What is the INDEPENDENT variable in this investigation?

• the soil
• the amount of light
• the amount of water
• the growth of each plant

Tags

NGSS.MS-LS1-5

A student places three identical plants in the same type of containers, uses the same type of soil and the same amount of water for each plant. This student places the three plants in three different locations. Plant A is placed in a sunny area, Plant B is placed in a shaded location, and Plant C is placed in the dark room. Each day this student records the growth of each plant. What is the DEPENDENT variable in this investigation?

• the soil
• the amount of light
• the amount of water
• the growth of each plant

Tags

NGSS.MS-LS1-5

Two students are debating weather playing video games increases a person's reaction time. To test this they decide to perform an experiment. One student spends an hour playing an intense video game while the other student watches. Afterward, they test their reaction times by seeing how quickly they can catch a ruler as it falls between their fingers. Based on the data they collected, what conclusion can be drawn about reaction times?

• playing video games increases reaction times
• playing video games decreases reaction times

Identify the INDEPENDENT variable in the following experiment: 3 identical beehives are kept in the same location but maintained at three different temperatures for a month. The bees from each hive have access to all the same flowers during the course of this experiment. Over the next month, the amount of honey each beehive produces is measured and recorded.

• the number of beehives
• the weight of each beehive
• the temperature of each beehive
• the amount of honey produced