Learn How to Write a Hypothesis

Biology Quiz - Unit 4 - Hypothesis (Questions)

This GCSE Biology quiz explores hypotheses, helping you practise turning scientific ideas into clear, testable predictions before planning and carrying out practical investigations.

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Fascinating Fact:

A hypothesis is not a guess. It is an informed idea that uses existing scientific understanding to predict an outcome.

In GCSE Biology, you use hypotheses to link scientific ideas with practical work. A good hypothesis clearly states how changing the independent variable is expected to affect the dependent variable in an experiment.

Key Terms

Hypothesis: An informed, testable statement predicting how one variable will affect another in an investigation.
Independent variable: The variable you deliberately change to see its effect in an experiment.
Dependent variable: The variable you measure to see how it responds to changes in the independent variable.

Frequently Asked Questions (Click to see answers)

What is a hypothesis in GCSE Biology?

In GCSE Biology, a hypothesis is a clear, testable statement that uses scientific ideas to predict how changing one variable will affect another in an investigation.

How do I write a good scientific hypothesis?

Write a hypothesis in a simple “If… then…” style, naming the independent and dependent variables and stating the expected relationship between them, based on scientific understanding.

Do I always need a hypothesis for a biology experiment?

Most GCSE Biology investigations use a hypothesis when you are testing a specific relationship. Some exploratory or observational activities may focus more on questions than on one fixed prediction.

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What is a scientific hypothesis?

[ ]	A fact supported by a prediction
[ ]	An outcome supported by experimental results
[ ]	A measurement made very accurately using complex equipment
[ ]	A prediction supported by scientific reasoning

When do we come up with a hypothesis?

[ ]	After obtaining results
[ ]	Before we start the experiment
[ ]	During the experiment
[ ]	After the conclusion

Another phrase to describe a hypothesis is...

[ ]	a sheer fluke
[ ]	an educated guess
[ ]	a red herring
[ ]	a shot in the dark

"I think that X will happen because of Y" is an example of...

[ ]	hypothesis
[ ]	anomaly
[ ]	conclusion
[ ]	bias

Which of these is a hypothesis?

[ ]	As the concentration of acid increases, I think the rate will also increase because there are more particles
[ ]	The results show that more acid increases the rate
[ ]	There is one odd result at an acid concentration of 10%
[ ]	I think that Leeds United are the best team in the world because they have the best players

Which of these is a hypothesis?

[ ]	As the temperature increased, the rate of reaction increased
[ ]	As the temperature increases, I think that the rate will also increase due to the increased kinetic energy of the particles
[ ]	As the temperature increases, things will start to happen
[ ]	As the temperature increased, the reactants fizzed and caused a massive explosion

Which is the correct order for an investigation?

[ ]	Conclusion, results, method, hypothesis
[ ]	Hypothesis, results, conclusion, method
[ ]	Hypothesis, method, results, conclusion
[ ]	Results, conclusion, hypothesis, method

After writing a hypothesis, we need to write the...

[ ]	conclusion
[ ]	results table
[ ]	variables list
[ ]	evaluation

Before we can start the experiment, we need to do a...

[ ]	risk assessment
[ ]	risk measurement
[ ]	risk statement
[ ]	risk awareness course

10.

The hypothesis that links fossils with prehistoric organisms can only be tested if....

[ ]	we could clone the organisms
[ ]	we could go back in time and do the experiments to prove it
[ ]	we could match them up with organisms alive today
[ ]	we could speed up the process of fossil formation

You can find more about this topic by visiting BBC Bitesize - Practical skills

Biology Quiz - Unit 4 - Hypothesis (Answers)

What is a scientific hypothesis?

[ ]	A fact supported by a prediction
[ ]	An outcome supported by experimental results
[ ]	A measurement made very accurately using complex equipment
[x]	A prediction supported by scientific reasoning

It doesn't matter if either the prediction or the reasoning is wrong - that will be decided by the experimental work you do to test the hypothesis

When do we come up with a hypothesis?

[ ]	After obtaining results
[x]	Before we start the experiment
[ ]	During the experiment
[ ]	After the conclusion

It is the very first thing that you need to do when planning an investigation

Another phrase to describe a hypothesis is...

[ ]	a sheer fluke
[x]	an educated guess
[ ]	a red herring
[ ]	a shot in the dark

A hypothesis is a prediction based on what you know, so it is an educated guess that can be tested

"I think that X will happen because of Y" is an example of...

[x]	hypothesis
[ ]	anomaly
[ ]	conclusion
[ ]	bias

This is probably the simplest way of describing a hypothesis

Which of these is a hypothesis?

[x]	As the concentration of acid increases, I think the rate will also increase because there are more particles
[ ]	The results show that more acid increases the rate
[ ]	There is one odd result at an acid concentration of 10%
[ ]	I think that Leeds United are the best team in the world because they have the best players

Option 2 is a conclusion, option 3 is an evaluation and option 4 does not indicate the dependent and independent variables precisely enough - what is meant by best team ... the one that scores the most goals? The one that wins the most matches? A hypothesis should be very precise

Which of these is a hypothesis?

[ ]	As the temperature increased, the rate of reaction increased
[x]	As the temperature increases, I think that the rate will also increase due to the increased kinetic energy of the particles
[ ]	As the temperature increases, things will start to happen
[ ]	As the temperature increased, the reactants fizzed and caused a massive explosion

The first and the last options must be wrong as they are written in the past tense. The third is not precise enough but the second option offers a prediction and a scientific reason

Which is the correct order for an investigation?

[ ]	Conclusion, results, method, hypothesis
[ ]	Hypothesis, results, conclusion, method
[x]	Hypothesis, method, results, conclusion
[ ]	Results, conclusion, hypothesis, method

We always start an investigation with a hypothesis

After writing a hypothesis, we need to write the...

[ ]	conclusion
[ ]	results table
[x]	variables list
[ ]	evaluation

Once you have decided on the variables, you can then begin to think about the experiments that you will do to test the hypothesis

Before we can start the experiment, we need to do a...

[x]	risk assessment
[ ]	risk measurement
[ ]	risk statement
[ ]	risk awareness course

You can only do this when you have decided on your method that you will use to carry out your experiment

10.

The hypothesis that links fossils with prehistoric organisms can only be tested if....

[ ]	we could clone the organisms
[x]	we could go back in time and do the experiments to prove it
[ ]	we could match them up with organisms alive today
[ ]	we could speed up the process of fossil formation

Yes! Believe it or not, without actually going back in time, the link between an actual fossil and an actual organism cannot usually be proven. Palaeontologists (scientists who study fossils) are now developing ways of obtaining DNA from certain fossils which can then be used to prove the links

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Biology Quiz - Unit 4 - Hypothesis (Questions)

Fascinating Fact:

Key Terms

Frequently Asked Questions (Click to see answers)

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