DOK 1 Understanding Experimental Investigations

What is a hypothesis in scientific investigations?

• A detailed description of the experiment

• A testable prediction about the outcome of the experiment

• A summary of the results

• A list of materials needed

Answer explanation

A hypothesis in scientific investigations is a testable prediction about the outcome of the experiment, not a detailed description of the experiment, a summary of the results, or a list of materials needed.

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DOK Level 1: Recall

Which of the following is an example of an independent variable?

• The amount of sunlight a plant receives

• The height of the plant

• The color of the plant's leaves

• The number of leaves on the plant

Answer explanation

The amount of sunlight a plant receives is an example of an independent variable because it can be controlled or manipulated to observe its effect on the plant's growth.

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DOK Level 1: Recall

Which of the following is an example of a dependent variable?

• The type of soil used

• The growth rate of a plant

• The amount of water given to the plant

• The type of fertilizer used

Answer explanation

The growth rate of a plant is an example of a dependent variable because it is influenced by other factors, such as the amount of water given or the type of fertilizer used.

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DOK Level 1: Recall

What does repetition in experiments help to ensure?

• The experiment is more complex

• The results are consistent and reliable

• The hypothesis is always correct

• The experiment is easier to perform

Answer explanation

Repetition in experiments helps to ensure that the results are consistent and reliable, increasing the validity of the findings.

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DOK Level 1: Recall

Why is replication important in scientific investigations?

• It allows for the experiment to be performed faster

• It helps to verify the results by different researchers

• It makes the experiment more interesting

• It reduces the cost of the experiment

Answer explanation

Replication is important in scientific investigations because it helps to verify the results by different researchers.

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DOK Level 1: Recall

What is the first step in an experimental investigation?

• Collecting data

• Formulating a hypothesis

• Analyzing results

• Drawing conclusions

Answer explanation

The first step in an experimental investigation is formulating a hypothesis. This is essential to guide the research and establish the basis for the experiment.

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DOK Level 1: Recall

Which of the following best describes a hypothesis?

• A random guess

• A testable statement

• A proven fact

• An untestable opinion

Answer explanation

A hypothesis is a testable statement that can be investigated and potentially proven or disproven through experimentation or observation.

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DOK Level 1: Recall

In an experiment, what is the role of the independent variable?

• It is the variable that is measured

• It is the variable that is changed or controlled

• It is the variable that remains constant

• It is the variable that is observed

Answer explanation

In an experiment, the role of the independent variable is to be the variable that is changed or controlled.

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DOK Level 1: Recall

In an experiment, what is the role of the dependent variable?

• It is the variable that is changed or controlled

• It is the variable that remains constant

• It is the variable that is measured

• It is the variable that is ignored

Answer explanation

In an experiment, the role of the dependent variable is to be measured. It is the variable that is being tested and observed for changes based on the independent variable.

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DOK Level 1: Recall

How does repetition improve the reliability of experimental results?

• By increasing the sample size

• By reducing the number of variables

• By ensuring the experiment is performed only once

• By making the experiment more difficult

Answer explanation

By increasing the sample size

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DOK Level 1: Recall