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Solving a biological problem
5 Class 9 Biology questions with answers and explanations.
Printable worksheet with answer key
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A testable explanation for an observation is called a:
- 1 Hypothesis
- 2 Theory
- 3 Law
- 4 Conclusion
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Correct answer: Hypothesis
A hypothesis is a proposed explanation that can be tested by experiment.
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In an experiment, the factor that is deliberately changed is the:
- 1 Dependent variable
- 2 Control
- 3 Independent variable
- 4 Constant
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Correct answer: Independent variable
The independent variable is the one the experimenter changes.
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A control group is used to:
- 1 Compare with the group being tested
- 2 Avoid recording data
- 3 Change the hypothesis
- 4 Increase the result
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Correct answer: Compare with the group being tested
The control group does not receive the treatment and gives a baseline for comparison.
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Which step comes first in the scientific method?
- 1 Publishing the result
- 2 Recognising a problem
- 3 Writing the conclusion
- 4 Analysing data
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Correct answer: Recognising a problem
The method begins with noticing a problem or asking a question.
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A theory differs from a hypothesis because a theory:
- 1 Cannot be changed ever
- 2 Is only about animals
- 3 Has been supported by a lot of evidence
- 4 Is a guess
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Correct answer: Has been supported by a lot of evidence
A theory is a well supported explanation backed by many tests.