Question 1

Which of the following best describes the difference between a scientific theory and a scientific hypothesis?

Accepted Answer

A scientific theory is a broad explanation supported by evidence, while a hypothesis is a testable prediction about a specific situation.

Question 2

A researcher wants to test if a new fertilizer increases plant growth. She sets up two groups of plants: one receives the fertilizer, and the other does not. What is the independent variable in this experiment?

Accepted Answer

Whether or not the plant receives fertilizer

Question 3

Which of the following is an example of pseudoscience?

Accepted Answer

A claim that a specific diet cures all diseases, based only on testimonials and not on controlled experiments

Question 4

In the context of scientific studies, what is the main purpose of a control group?

Accepted Answer

To provide a baseline for comparison with the experimental group

Question 5

Which of the following best illustrates cognitive dissonance in a scientific context?

Accepted Answer

A scientist ignores new evidence that contradicts her previous findings because it makes her uncomfortable

Question 6

A study claims that a new drug reduces headaches. The study included 10 participants, all of whom reported improvement. Which of the following is the most significant limitation of this study?

Accepted Answer

The sample size is too small to draw reliable conclusions

Question 7

Which of the following statements about the scientific method is correct?

Accepted Answer

The scientific method involves making observations, forming hypotheses, testing predictions, and revising theories based on evidence

Question 8

Which of the following best describes the difference between reliability and validity in scientific experiments?

Accepted Answer

Reliability refers to how consistent results are, while validity refers to whether the experiment measures what it is supposed to measure

Question 9

A scientist is testing the effect of temperature on enzyme activity. She measures the rate of reaction at different temperatures. Which variable is the dependent variable?

Accepted Answer

The rate of reaction measured

Question 10

Which of the following is the best example of empirical evidence?

Accepted Answer

Data collected from controlled experiments and observations

Question 11

A biologist is classifying a newly discovered organism. Which of the following characteristics would be most useful in determining its domain?

Accepted Answer

The presence or absence of a nucleus in its cells

Question 12

Which of the following best explains why large sample sizes are important in scientific studies?

Accepted Answer

They reduce the impact of random variation and increase the reliability of results

Question 13

A student claims that astrology is a science because it makes predictions. Which of the following is the best scientific response to this claim?

Accepted Answer

Astrology is not a science because its predictions are not testable or based on empirical evidence

Question 14

Which of the following is an example of a well-constructed scientific hypothesis?

Accepted Answer

If fertilizer is added to soil, then plant growth will increase.

Question 15

In a published study, researchers found a correlation between ice cream sales and drowning incidents. Which of the following is the most scientifically valid interpretation?

Accepted Answer

Both ice cream sales and drowning incidents increase during hot weather, so a third variable is likely responsible.

Question 16

Which of the following best describes the process of peer review in science?

Accepted Answer

Other experts in the field evaluate the research for quality and validity before publication

Question 17

A scientist is designing an experiment to test the effect of light intensity on photosynthesis rate. She measures the amount of oxygen produced by plants under different light intensities. Which of the following is the best way to graph her results?

Accepted Answer

Plot light intensity on the $x$-axis and oxygen produced on the $y$-axis

Question 18

Which of the following is a key characteristic that distinguishes science from pseudoscience?

Accepted Answer

Science relies on empirical evidence and testable hypotheses, while pseudoscience does not

Question 19

A researcher is analyzing data from an experiment and finds that the results are statistically significant. What does this mean?

Accepted Answer

The results are unlikely to have occurred by chance, according to a predetermined threshold (such as $p < 0.05$)

Question 20

Which of the following best explains why double-blind studies are important in scientific research?

Accepted Answer

They prevent both the participants and the experimenters from knowing who receives the treatment, reducing bias

General Biology Study Guide: The Nature of Science, Pseudoscience, and Experimental Design

Study Guide - Practice Questions

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