Intro to Biology Quiz

After analyzing experimental results, a scientist finds that the data does not match the prediction. What is the most logical next step?

• Discard the experiment

• Re-examine the hypothesis and experimental design

• Change the results to fit the prediction

• Publish the results anyway

What is the main purpose of a control group in an experiment?

• To provide a standard for comparison

• To increase the number of variables

• To ensure the hypothesis is correct

• To collect more data

What is the role of controlled variables in an experiment?

• To be measured as the outcome

• To be changed to test the hypothesis

• To be kept constant to ensure a fair test

• To be used as a comparison

Which of the following best describes a hypothesis in the scientific method?

• A summary of the results of an experiment

• A testable statement or prediction based on observations

• A list of materials used in an experiment

• A graph showing experimental data

Which of the following scenarios best illustrates the use of inference in scientific research?

• Measuring the mass of a rock

• Noting that a plant’s leaves are wilted and concluding it needs water

• Recording the color of a solution

• Listing the steps of an experiment

Which of the following best describes an inference?

• A direct measurement taken during an experiment

• A conclusion drawn from evidence and reasoning

• A variable that is kept constant

• A prediction about future results

Which of the following best explains why it is important to have only one independent variable in an experiment?

• To make the experiment more interesting

• To ensure that the results are due to the variable being tested

• To collect more data

• To make the experiment easier to perform

A written statement, including a prediction, that can be tested.

• Assumption

• Hypothesis

• Inference

• Observation

A student measures the temperature of water every minute as it is heated. What type of data is being collected, and what is the dependent variable?

• Qualitative; time

• Quantitative; temperature

• Qualitative; temperature

• Quantitative; time

A researcher wants to know if a new drug lowers blood pressure. She gives the drug to one group and a placebo to another. What is the purpose of the placebo group?

• To test a different drug

• To serve as the control group for comparison

• To increase the sample size

• To measure side effects