1. The biological method is mainly used to:
A) Memorize facts
B) Solve biological problems scientifically
C) Classify organisms only
D) Draw diagrams only
2. The first step in solving a biological problem is:
A) Observation
B) Experimentation
C) Data analysis
D) Conclusion
3. A tentative explanation for an observation is called a:
A) Law
B) Theory
C) Principle
D) Hypothesis
4. A deduction is:
A) A random guess
B) A laboratory instrument
C) A logical prediction based on a hypothesis
D) A biological classification
5. Which step is used to test a hypothesis?
A) Observation
B) Experimentation
C) Classification
D) Publication
6. The results of an experiment should be:
A) Recorded carefully and analyzed
B) Ignored if unexpected
C) Memorized without checking
D) Changed to fit expectations
7. A scientific theory is developed after:
A) One observation only
B) One experiment only
C) A random opinion
D) Repeated testing and supporting evidence
8. Which scientist is associated with discovering the relationship between stomach ulcers and bacteria?
A) Charles Darwin
B) Barry Marshall
C) Gregor Mendel
D) Robert Hooke
9. Barry Marshall identified the bacterium:
A) Escherichia coli
B) Salmonella typhi
C) Helicobacter pylori
D) Vibrio cholerae
10. Data collected during an experiment should be:
A) Accurate and unbiased
B) Estimated without measurement
C) Copied from others
D) Ignored if inconsistent
11. Which of the following best describes a controlled experiment?
A) Several variables changed at once
B) Only one variable is tested while others are kept constant
C) No observations are recorded
D) Results are based on guesses
12. The purpose of analyzing experimental data is to:
A) Increase sample size
B) Change observations
C) Repeat the hypothesis
D) Determine whether the hypothesis is supported
13. Which step follows experimentation in the biological method?
A) Observation
B) Hypothesis
C) Summarizing and analyzing results
D) Making deductions
14. A hypothesis should be:
A) Testable
B) Impossible to verify
C) Based only on opinion
D) Accepted without evidence
15. Which skill is most important during scientific observation?
A) Guessing
B) Careful recording of facts
C) Memorizing definitions
D) Drawing conclusions immediately
16. Repeating an experiment helps to:
A) Waste time
B) Avoid collecting data
C) Change the hypothesis
D) Improve the reliability of results
17. The final conclusion of an investigation should be based on:
A) Personal beliefs
B) Random opinions
C) Experimental evidence and analysis
D) Internet popularity
18. Which of the following is an example of a biological problem?
A) Determining the cause of a disease
B) Memorizing scientific names
C) Drawing a flower
D) Counting pages in a book
19. A hypothesis is accepted only after it is:
A) Published in a book
B) Approved by students
C) Supported by experimental evidence
D) Written in a laboratory notebook
20. Which step comes immediately after making observations?
A) Drawing conclusions
B) Formulating a hypothesis
C) Publishing results
D) Repeating experiments
21. Barry Marshall proved his hypothesis by:
A) Growing plants
B) Observing birds
C) Classifying bacteria
D) Conducting experiments on himself
22. Which of the following is essential for a fair experiment?
A) Controlling variables
B) Changing all variables together
C) Ignoring measurements
D) Depending on guesses
23. Experimental results should be:
A) Hidden from others
B) Recorded honestly
C) Changed if unexpected
D) Based on assumptions only
24. Which scientist received the Nobel Prize for work on stomach ulcers and Helicobacter pylori?
A) Louis Pasteur
B) Alexander Fleming
C) Barry Marshall
D) Robert Koch
25. A scientific investigation should be based on:
A) Personal opinion
B) Rumors
C) Assumptions only
D) Evidence and logical reasoning
26. Which step helps verify whether deductions are correct?
A) Experimentation
B) Observation only
C) Classification
D) Naming organisms
27. The process of arranging collected information into tables or graphs is part of:
A) Observation
B) Hypothesis formation
C) Data analysis
D) Deduction
28. Which quality is most important for a scientist?
A) Bias
B) Honesty
C) Speed only
D) Guesswork
29. A prediction made from a hypothesis is known as:
A) Deduction
B) Classification
C) Theory
D) Observation
30. Which statement about hypotheses is correct?
A) They are always true.
B) They cannot be tested.
C) They replace experiments.
D) They may be accepted or rejected after testing.
31. In a controlled experiment, the factor being tested is called the:
A) Constant
B) Variable
C) Conclusion
D) Observation
32. Which of the following best describes scientific reasoning?
A) Depending on luck
B) Accepting rumors
C) Drawing conclusions from evidence
D) Ignoring data
33. Reproducible results strengthen the:
A) Reliability of an investigation
B) Number of observations only
C) Length of a report
D) Difficulty of the experiment
34. Which of the following is NOT part of the biological method?
A) Observation
B) Hypothesis
C) Experimentation
D) Guessing without evidence
35. A hypothesis that is repeatedly supported by experiments may contribute to a scientific:
A) Observation
B) Theory
C) Diagram
D) Table
36. The main purpose of a control group in an experiment is to:
A) Provide a standard for comparison
B) Increase the number of variables
C) Eliminate observations
D) Prove every hypothesis correct
37. Which of the following best represents scientific thinking?
A) Accepting claims without evidence
B) Depending only on opinions
C) Ignoring conflicting data
D) Evaluating evidence logically
38. Which step is performed before drawing a conclusion?
A) Publishing the results
B) Making a new hypothesis
C) Analyzing experimental data
D) Naming the organism
39. The purpose of repeating an experiment is to:
A) Increase costs
B) Confirm the consistency of results
C) Avoid collecting data
D) Change the observations
40. Which of the following is an example of an observation?
A) A plant grows taller after receiving fertilizer
B) Plants always need magic to grow
C) Every disease has the same cause
D) Experiments are unnecessary
41. Which scientist demonstrated that Helicobacter pylori could cause stomach ulcers?
A) Robert Hooke
B) Antonie van Leeuwenhoek
C) Gregor Mendel
D) Barry Marshall
42. Which characteristic is essential for valid scientific experiments?
A) Bias
B) Guesswork
C) Accuracy
D) Personal preference
43. If experimental evidence does not support a hypothesis, the scientist should:
A) Revise or reject the hypothesis
B) Ignore the results
C) Change the data
D) Stop the investigation permanently
44. A deduction is mainly based on:
A) Random chance
B) Logical reasoning from a hypothesis
C) Imagination only
D) Personal opinion
45. Which of the following is most likely to reduce experimental errors?
A) Guessing measurements
B) Recording only favorable data
C) Changing procedures frequently
D) Using proper measuring instruments and repeating trials
46. Which part of the biological method involves collecting measurable information?
A) Theory formation
B) Deduction
C) Observation and experimentation
D) Classification
47. Which of the following best describes a variable in an experiment?
A) A factor that can change and affect results
B) A fixed scientific law
C) The final conclusion
D) A laboratory instrument
48. Scientific conclusions should always be:
A) Based on opinions
B) Based on evidence obtained from experiments
C) Accepted without testing
D) Identical for every investigation
49. Which step of the biological method helps communicate findings to other scientists?
A) Observation
B) Hypothesis formation
C) Reporting and publishing results
D) Making deductions
50. The main objective of Chapter 2 “Solving a Biological Problem” is to help students understand:
A) Classification of living organisms only
B) Cell structure only
C) Human body systems only
D) The biological method, hypothesis, deductions, experimentation, data analysis, and evidence-based scientific reasoning used to solve biological problems