WGU C491 Integrated Natural Science – Full
Practice Exam
EXAM OVERVIEW
The WGU C491 Integrated Natural Science exam assesses interdisciplinary
scientific knowledge across multiple domains: scientific inquiry and
experimental design, biology (cell structure, genetics, evolution, ecology),
chemistry (atomic structure, bonding, pH, organic molecules), physics
(forces, energy, waves), and earth/space science (geology, climate,
astronomy).
SECTION 1: Scientific Inquiry & Experimental Design (Questions 1-10)
Q1. A scientist observes that plants grow taller when given fertilizer.
She hypothesizes that nitrogen in the fertilizer promotes growth. She
plants 20 seeds, gives 10 fertilizer, and gives 10 no fertilizer. What is the
independent variable?
• A) Plant height
• B) Fertilizer (presence of nitrogen)
• C) Type of seed
• D) Amount of water
Answer: B – The independent variable is what the researcher manipulates
(fertilizer). The dependent variable is what is measured (plant height).
Controlled variables must remain constant.
Q2. A scientist repeats an experiment three times and gets similar
results. This demonstrates:
• A) Accuracy
• B) Validity
, • C) Reliability (precision)
• D) Bias
Answer: C – Reliability refers to consistency of measurements. Accuracy is
closeness to the true value. Validity measures whether the experiment
tests what it intends to test.
Q3. In a controlled experiment, the group that does NOT receive the
treatment is called the:
• A) Experimental group
• B) Control group
• C) Variable group
• D) Independent group
Answer: B – The control group establishes a baseline for comparison. It is
identical to the experimental group except for the independent variable
being tested.
Q4. A hypothesis is best defined as:
• A) A proven fact
• B) A testable explanation for an observation
• C) A conclusion after experimentation
• D) A guess without evidence
Answer: B – A hypothesis is a testable explanation for a scientific
observation. It must be falsifiable and lead to predictions that can be tested
experimentally.
Q5. Which step of the scientific method comes AFTER data collection?
• A) Formulating a hypothesis
, • B) Making an observation
• C) Analyzing results and drawing conclusions
• D) Conducting background research
Answer: C – The scientific method proceeds: observation → question →
hypothesis → experiment → data collection → analysis/conclusion →
communication.
Q6. A scientist wants to test whether a new drug lowers blood pressure.
She gives the drug to 50 participants and a placebo to 50 participants.
Neither the participants nor the researchers know who received the
drug. This is a:
• A) Single-blind study
• B) Double-blind study
• C) Open-label study
• D) Case study
Answer: B – Double-blind studies minimize bias by preventing both
participants and researchers from knowing group assignments.
Q7. Which of the following is a qualitative observation?
• A) The plant grew 5 cm in one week
• B) The solution has a temperature of 25°C
• C) The liquid turned blue when the chemical was added
• D) The mass of the sample is 2.5 grams
Answer: C – Qualitative observations describe qualities (color, smell,
texture) using words. Quantitative observations use numbers and
measurements.
, Q8. A researcher measures plant height, number of leaves, and stem
diameter. These are all examples of:
• A) Categorical variables
• B) Independent variables
• C) Dependent variables
• D) Controlled variables
Answer: C – Dependent variables are measured outcomes that may
change in response to the independent variable. Multiple dependent
variables can be measured in one experiment.
Q9. The "placebo effect" refers to:
• A) A drug that has no effect
• B) A response to an inactive treatment due to belief
• C) An error in experimental design
• D) A chemical reaction in the body
Answer: B – The placebo effect occurs when a participant experiences a
perceived or actual improvement after receiving an inactive treatment, due
to expectation or belief.
Q10. A graph showing the relationship between two continuous
variables is best displayed using a:
• A) Bar graph
• B) Pie chart
• C) Scatter plot
• D) Line graph
Practice Exam
EXAM OVERVIEW
The WGU C491 Integrated Natural Science exam assesses interdisciplinary
scientific knowledge across multiple domains: scientific inquiry and
experimental design, biology (cell structure, genetics, evolution, ecology),
chemistry (atomic structure, bonding, pH, organic molecules), physics
(forces, energy, waves), and earth/space science (geology, climate,
astronomy).
SECTION 1: Scientific Inquiry & Experimental Design (Questions 1-10)
Q1. A scientist observes that plants grow taller when given fertilizer.
She hypothesizes that nitrogen in the fertilizer promotes growth. She
plants 20 seeds, gives 10 fertilizer, and gives 10 no fertilizer. What is the
independent variable?
• A) Plant height
• B) Fertilizer (presence of nitrogen)
• C) Type of seed
• D) Amount of water
Answer: B – The independent variable is what the researcher manipulates
(fertilizer). The dependent variable is what is measured (plant height).
Controlled variables must remain constant.
Q2. A scientist repeats an experiment three times and gets similar
results. This demonstrates:
• A) Accuracy
• B) Validity
, • C) Reliability (precision)
• D) Bias
Answer: C – Reliability refers to consistency of measurements. Accuracy is
closeness to the true value. Validity measures whether the experiment
tests what it intends to test.
Q3. In a controlled experiment, the group that does NOT receive the
treatment is called the:
• A) Experimental group
• B) Control group
• C) Variable group
• D) Independent group
Answer: B – The control group establishes a baseline for comparison. It is
identical to the experimental group except for the independent variable
being tested.
Q4. A hypothesis is best defined as:
• A) A proven fact
• B) A testable explanation for an observation
• C) A conclusion after experimentation
• D) A guess without evidence
Answer: B – A hypothesis is a testable explanation for a scientific
observation. It must be falsifiable and lead to predictions that can be tested
experimentally.
Q5. Which step of the scientific method comes AFTER data collection?
• A) Formulating a hypothesis
, • B) Making an observation
• C) Analyzing results and drawing conclusions
• D) Conducting background research
Answer: C – The scientific method proceeds: observation → question →
hypothesis → experiment → data collection → analysis/conclusion →
communication.
Q6. A scientist wants to test whether a new drug lowers blood pressure.
She gives the drug to 50 participants and a placebo to 50 participants.
Neither the participants nor the researchers know who received the
drug. This is a:
• A) Single-blind study
• B) Double-blind study
• C) Open-label study
• D) Case study
Answer: B – Double-blind studies minimize bias by preventing both
participants and researchers from knowing group assignments.
Q7. Which of the following is a qualitative observation?
• A) The plant grew 5 cm in one week
• B) The solution has a temperature of 25°C
• C) The liquid turned blue when the chemical was added
• D) The mass of the sample is 2.5 grams
Answer: C – Qualitative observations describe qualities (color, smell,
texture) using words. Quantitative observations use numbers and
measurements.
, Q8. A researcher measures plant height, number of leaves, and stem
diameter. These are all examples of:
• A) Categorical variables
• B) Independent variables
• C) Dependent variables
• D) Controlled variables
Answer: C – Dependent variables are measured outcomes that may
change in response to the independent variable. Multiple dependent
variables can be measured in one experiment.
Q9. The "placebo effect" refers to:
• A) A drug that has no effect
• B) A response to an inactive treatment due to belief
• C) An error in experimental design
• D) A chemical reaction in the body
Answer: B – The placebo effect occurs when a participant experiences a
perceived or actual improvement after receiving an inactive treatment, due
to expectation or belief.
Q10. A graph showing the relationship between two continuous
variables is best displayed using a:
• A) Bar graph
• B) Pie chart
• C) Scatter plot
• D) Line graph
