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A1.1 · Form research questions, predictions, and testable hypotheses

Learn to form research questions, predictions, and testable hypotheses through clear examples and targeted practice.

Ontario Grade 11 Biology

Scientific Investigation Skills and Career Exploration

Ontario Grade 11 Biology — A1.1

In SNC2D, you learned to ask questions about the natural world and use evidence to investigate them. A biological investigation begins in the same way: notice something, ask a question, and decide what evidence could help answer it. For example, you might notice that a plant beside a bright window appears different from one farther away. That observation can lead to several questions, but not all are clear enough to investigate. In this lesson, you will practise turning an observation into a research question, a prediction, and a testable hypothesis. These are connected, but they are not interchangeable.

What you will learn

Turn a biological observation into a focused research question.
Write a prediction that states an expected result.
Write a testable hypothesis that links a proposed change to an outcome.
Identify what evidence could support or fail to support a hypothesis.

1. From an observation to a research question

An observation is information gathered using the senses or a measuring tool. It can suggest a pattern, but it does not by itself explain why the pattern occurs. Seeing two plants that look different is an observation; concluding that light caused the difference is an explanation that still needs evidence.

A research question is a focused question that an investigation can address with evidence. A useful question names the biological subject and the factor or outcome of interest. It should be narrow enough that a researcher can decide what to observe or measure.

A broad question such as “Why do plants grow?” has many possible answers and is difficult to investigate in one study. A more focused question might ask whether the amount of light is related to the height of a particular kind of plant over a stated period. The wording does not claim that light is already known to be the cause.

Before using a question, check whether its terms can be made clear. For example, “more light” needs a consistent meaning in the investigation. It could refer to hours of light each day, but the question must say so if that is what the researcher intends. A clear measure lets another person understand what evidence would count as an answer.

An observation describes what was noticed; it does not establish a cause.
A research question identifies a subject, a focus, and an answerable investigation.
Define vague words by stating what will be observed or measured.

2. Prediction and testable hypothesis

A prediction states what you expect to observe if a proposed idea is correct. It is an expected result, not proof. A prediction should be specific enough that the researcher can compare it with the evidence collected.

A hypothesis is a proposed explanation or relationship that can be investigated. A testable hypothesis connects a factor that may change with an outcome that can be observed or measured. In this lesson, the factor deliberately changed is called the independent variable. The outcome recorded is called the dependent variable. These names help describe an investigation; they do not guarantee that the factor caused the outcome.

For a simple investigation, a hypothesis can be written in a cause-and-effect form: “If [independent variable] changes, then [dependent variable] will change in a stated way, because [a reason that can be investigated].” The prediction can then state the expected result more directly. Keep the hypothesis and prediction linked, but do not treat them as the same sentence or purpose.

A hypothesis is testable when evidence could be collected that is relevant to it and could show that its expected pattern is absent. A claim such as “plants prefer nice conditions” is not testable as written because “nice” has no clear measure. A more useful claim names a condition and an observable outcome.

A fair comparison helps make evidence useful. Keep other relevant conditions as similar as practical, and change or compare the factor named in the question. If several conditions differ at once, it may be unclear which one relates to the observed outcome. A result may support a hypothesis, but one investigation does not turn a proposed explanation into certainty.

A prediction states an expected observation or result.
A testable hypothesis proposes a relationship that evidence can examine.
Name the factor being changed or compared and the outcome being recorded.
Evidence can support or fail to support a hypothesis; it does not guarantee certainty.

3. A practical model for planning the inquiry

Use the sequence below to keep the parts of an inquiry distinct. Begin with an observation, then form a question. State a testable hypothesis and a matching prediction. Finally, describe the evidence that would let you compare the prediction with what happens.

The evidence plan should make the question answerable. It identifies what will be compared and what will be recorded, without claiming a result in advance. In a classroom study, the teacher should approve the plan and provide safe, appropriate materials. A plan is not permission to collect organisms or handle specimens without supervision.

Suppose a class observes that seedlings on a shelf appear shorter than seedlings near a window. The observation suggests a question about light and height, but location may also involve other differences. A careful plan would define the light condition and the height measure, and consider which other conditions should be kept similar. This improves the investigation without assuming the original observation proves a cause.

The model is a planning aid, not a guarantee of a perfect investigation. A question can be clear while the available method is limited. State important limits, such as a small number of observations, unclear measurements, or other conditions that were not controlled. Then avoid making a conclusion broader than the evidence allows.

Plan evidence before collecting it.
Use clear definitions for the condition and outcome.
Consider other factors that could affect the comparison.
Keep conclusions within the limits of the evidence.

4. Improving questions and interpreting evidence

A strong inquiry separates three things: what was observed, what is being asked, and what is proposed as an explanation. This separation prevents an assumption from being mistaken for evidence. For instance, “the seedlings are shorter because they get less light” combines an observation with an untested explanation. Rewriting it as a question and hypothesis makes the claim possible to examine.

When evidence does not match a prediction, do not hide or change the result to fit the hypothesis. The hypothesis may need revision, or the method may not have measured the question clearly. Check whether the conditions were consistent and whether the outcome was recorded as planned. An unexpected result is information about the investigation, not a failure to follow the idea.

When evidence does match a prediction, say that the result is consistent with the hypothesis under the conditions studied. Avoid saying that it proves the hypothesis for every plant or every setting. A conclusion should distinguish the observed pattern from the explanation offered for it.

Do not present an explanation as though it were directly observed.
Compare evidence with the prediction, including results that do not match.
Describe support carefully and state limits.

Three connected parts of an inquiry

Part	Purpose	Plant example
Research question	Asks what evidence will address	How is daily light time related to seedling height?
Hypothesis	Proposes a testable relationship	More daily light time will be associated with greater height under similar conditions.
Prediction	States the expected observation	The group given more light time will have greater recorded height.

Worked example

Example 1: Make a broad plant question investigable

A student notices that plants in different parts of a classroom look different. Turn this observation into a research question, hypothesis, and prediction about light and plant height.

Separate the observation from an explanation
The observation is that plants in different locations look different. It does not yet show that light caused the difference. Other conditions might differ between locations.
Focus the question
Ask about one defined light condition and one measurable outcome. For example, compare daily hours of light with the height of the same kind of plant over a stated growing period.
State a hypothesis and prediction
A testable hypothesis proposes that seedlings receiving more hours of light each day will have greater height at the end of the stated period, if other relevant conditions are kept similar. The matching prediction is that the group receiving more hours of light will have a greater recorded height at the end. This is an expectation, not a reported result.
Identify useful evidence
Record the light schedule and measure plant height consistently. Keep other relevant conditions similar where practical. If they cannot be kept similar, note that as a limit when interpreting the comparison.

Answer: Research question: How is the number of light hours each day related to the height of this kind of seedling after the stated growing period? Hypothesis: Seedlings receiving more hours of light each day will have greater height, if other relevant conditions are similar. Prediction: The group given more light hours will have greater recorded height at the end.

Check: The question asks about a relationship, the hypothesis proposes one, and the prediction states an expected observation. No result has been invented.

Worked example

Example 2: Revise a claim that is not yet testable

A student says, “Worms like damp soil.” Explain why this is unclear, then revise it into a question, hypothesis, and prediction that could be investigated under teacher supervision.

Find the unclear words
“Like” does not state what will be observed, and “damp” does not say how moisture will be defined. Without clear meanings, different investigators could judge the claim in different ways.
Choose observable terms
A classroom investigation could ask whether two defined soil-moisture conditions are related to the number of worms observed in a teacher-approved setup. The exact measure and safe procedure must be planned with the teacher; this example does not instruct learners to collect organisms.
Write the proposed relationship
A testable hypothesis is that the number of worms observed will differ between the two defined moisture conditions. A prediction makes the expected direction explicit: more worms will be observed in the condition defined as moist. This prediction can be compared with evidence and may not be supported.
Limit the conclusion
A difference in observations would not by itself show that worms consciously prefer one condition. The conclusion should describe the recorded pattern and recognize that the setup and other conditions may affect the result.

Answer: Question: Does the number of worms observed differ between two clearly defined soil-moisture conditions in a teacher-approved setup? Hypothesis: The number observed will differ between the conditions. Prediction: More worms will be observed in the condition defined as moist.

Check: The revised version replaces vague terms with defined conditions and an observable outcome. It proposes a pattern without claiming a result or a mental state.

Worked example

Example 3: Make a question more precise when several factors may matter

A class asks, “Does water affect seedlings?” Improve the question and plan a matching hypothesis and prediction. Explain one limitation to consider.

Narrow the question
“Affect” does not name an outcome, and “water” does not specify what will vary. Choose one outcome that can be recorded, such as seedling height at a stated time, and a defined water schedule.
Form the inquiry
A focused question could ask how the amount of water supplied on a stated schedule is related to seedling height after a set period. The investigation should compare clearly defined amounts and use the same kind of seedling.
Connect the hypothesis to a prediction
A testable hypothesis might propose that seedlings receiving different defined amounts of water will differ in height after the period. A prediction must state the expected direction only if the student has a reason for that expectation. For example, the student may predict that a selected amount will be associated with greater height than a lower amount. This is a prediction to test, not a guaranteed outcome.
Consider the limitation
If light, container conditions, or starting seedlings differ between groups, those differences could also relate to height. Keep such conditions similar where practical and describe any remaining differences. The evidence would then support a conclusion only about the conditions investigated.

Answer: A suitable question names the seedling outcome, the water condition, and the time of measurement. The hypothesis proposes a relationship between the defined water amounts and height. The prediction states which group is expected to have greater height, while recognizing that the expectation must be checked against evidence.

Check: A question can be improved by defining both the factor and the outcome. The limitation reminds the researcher not to attribute a difference to water if other conditions also vary.

Common mistakes and how to avoid them

Treating an observation as proof of its cause.

Correction: State what was observed separately from the explanation, then design an investigation that can examine the explanation.

Writing a prediction as a vague statement such as “the plants will do better.”

Correction: Name the outcome and state the expected direction, such as greater recorded height.

Using words such as “nice,” “healthy,” or “like” without explaining how they will be judged.

Correction: Define the condition and outcome in observable or measurable terms.

Saying that matching evidence proves a hypothesis in every situation.

Correction: Say that the evidence supports or is consistent with the hypothesis under the conditions studied.

Lesson summary

Begin with an observation, but do not confuse it with an explanation.
A research question should identify a biological subject and a focused, answerable issue.
A testable hypothesis proposes a relationship that evidence can examine.
A prediction states what result is expected if the hypothesis is supported.
Plan clear observations or measurements, consider other conditions, and limit conclusions to the evidence.

Check your understanding

Question 1

A student observes that seedlings near a window are taller. Which statement is a research question rather than an observation or prediction?

Seedlings near the window are taller.
Will seedlings given more daily light have greater height after the same growing period?
Seedlings given more daily light will be taller.
Light always makes every plant grow taller.

Show answer and explanation

Will seedlings given more daily light have greater height after the same growing period?

This asks an answerable question about a defined factor and outcome. The first statement is an observation, the third is a prediction, and the fourth is an overbroad claim.

Question 2

Which feature makes a hypothesis testable?

It uses confident wording.
It agrees with the student's first impression.
It links a defined condition to an outcome that can be observed or measured.
It guarantees that the predicted result will occur.

Show answer and explanation

It links a defined condition to an outcome that can be observed or measured.

A testable hypothesis identifies a relationship that evidence can examine. Confidence and first impressions do not make a claim testable, and a hypothesis does not guarantee an outcome.

Question 3

Evidence matches a prediction in one classroom investigation. What is the most careful conclusion?

The hypothesis is proven for all plants.
The evidence is consistent with the hypothesis under the conditions studied.
The prediction must be treated as a new observation from before the investigation.
No conclusion can be made from any investigation.

Show answer and explanation

The evidence is consistent with the hypothesis under the conditions studied.

A matching result can support a hypothesis in the conditions investigated, but it does not establish that the claim applies everywhere.

Key terms

Observation: Information noticed or recorded using the senses or a measuring tool.
Research question: A focused question that an investigation can address with evidence.
Hypothesis: A proposed explanation or relationship that can be investigated.
Prediction: A statement of the result expected if an idea is supported.
Independent variable: The factor deliberately changed or compared in an investigation.
Dependent variable: The outcome observed or measured in an investigation.
Evidence: Observations or measurements used to address a research question.

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Published by DoAssignment. This reviewed lesson follows Ontario Grade 11 Biology (SBI3U), expectation A1.1. It is a study resource, not an official curriculum publication.

Before publication, content is checked for structure, mathematical or chemical notation, calculations, course boundaries, and readability. Errors can still occur, so corrections are welcomed.

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