A scientist is developing a new, more efficient hand sanitizer. They test its effectiveness by measuring the number of bacteria colonies on a petri dish after a treatment. Which of the following describes the dependent variable in this experiment?

• The type of hand sanitizer used

• The amount of hand sanitizer used

• The number of bacteria colonies counted

• The type of bacteria in the petri dish

Tags

NGSS.HS-ETS1-1

A student observes a bee flying from one flower to another to collect pollen and nectar. The bee uses the pollen and nectar for energy. This is an example of which characteristic of life?

• Growth and Development

• Response to Stimuli

• Use of Energy

• Homeostasis

Tags

NGSS.HS-LS1-2

While using a compound light microscope, a student uses the 4x objective lens with a 10x eyepiece. What is the total magnification of the specimen?

• 4x

• 10x

• 14x

• 40x

Tags

NGSS.HS-LS1-1

A student is observing a cheek cell under a microscope. The image is blurry, so they turn the fine adjustment knob. The primary purpose of this action is to:

•  Increase the amount of light on the specimen

• Decrease the magnification of the image

• Make large changes to the stage height

• Sharpen the focus of the specimen

Tags

NGSS.HS-LS1-1

Which characteristic of life is best represented when a plant bends toward a light source?

• Response to Stimuli

• Regulation (Homeostasis)

• Reproduction

• Evolutionary Adaptation

Tags

NGSS.HS-LS1-2

A student is designing an experiment to test the effect of different colors of light on the growth of bean plants. All plants are given the same amount of water, soil, and are kept at the same temperature. In this experiment, the amount of water and soil are considered:

• Constants

• Dependent variables

• Independent variables

• Control groups

Tags

NGSS.HS-ETS1-2

A scientist proposes that a certain chemical prevents the growth of a specific type of fungus. This proposal, based on observations and background knowledge, is called a(n):

• Theory

• Law

• Hypothesis

• Conclusion

Tags

NGSS.HS-ETS1-2

Which of the following is an example of an organism maintaining homeostasis?

• A snake shedding its skin

• A human shivering to generate body heat in a cold room

• A rose bush producing a flower

• A spider spinning a web

Tags

NGSS.HS-LS1-2

When creating a scientific model to show how a new medicine affects a cell, it is important to include the relevant components and interactions. This relates to the standard of using a model to illustrate the hierarchical organization of systems within an organism. Which of the following is the most appropriate example?

• A food web showing energy flow

• A graph of plant height over time

• A diagram showing how a drug molecule interacts with a protein receptor on a cell membrane

• A chart of different types of living organisms

Tags

NGSS.HS-LS1-2

A student is heating a test tube over a Bunsen burner. The safest lab practice is to:

• Aim the opening of the test tube at their lab partner

• Look directly down into the test tube to see the contents

• Wear safety goggles and point the opening away from themselves and others

• Use their hand to hold the test tube directly over the flame

Tags

NGSS.HS-ETS1-3