Solving a biological problem

Written by Dr. Hira Salman (Biology)

Class 9 · Biology · 9 questions

Name: ____________________ Date: ____________

A testable explanation for an observation is called a:
- A Hypothesis
- B Theory
- C Law
- D Conclusion
In an experiment, the factor that is deliberately changed is the:
- A Dependent variable
- B Control
- C Independent variable
- D Constant
A control group is used to:
- A Compare with the group being tested
- B Avoid recording data
- C Change the hypothesis
- D Increase the result
Which step comes first in the scientific method?
- A Publishing the result
- B Recognising a problem
- C Writing the conclusion
- D Analysing data
A theory differs from a hypothesis because a theory:
- A Cannot be changed ever
- B Is only about animals
- C Has been supported by a lot of evidence
- D Is a guess
Data collected as numbers is called:
- A A control
- B Qualitative data
- C A hypothesis
- D Quantitative data
The final step of a scientific investigation is to:
- A Draw and report conclusions
- B Change the hypothesis before testing
- C Hide the data
- D Stop observing
An observation involving descriptions such as colour is:
- A A law
- B A theory
- C Quantitative
- D Qualitative
A variable kept the same during an experiment is the:
- A Controlled variable
- B Dependent variable
- C Result
- D Independent variable

Answer key

1. A, 2. C, 3. A, 4. B, 5. C, 6. D, 7. A, 8. D, 9. A

A hypothesis is a proposed explanation that can be tested by experiment.
The independent variable is the one the experimenter changes.
The control group does not receive the treatment and gives a baseline for comparison.
The method begins with noticing a problem or asking a question.
A theory is a well supported explanation backed by many tests.
Numbers and measurements are quantitative data.
Conclusions are communicated at the end.
Qualitative data describes qualities.
Controlled variables are kept constant for a fair test.