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Predictions and Evidence

A scientific prediction is a testable expected result, and evidence is the observation or data used to support, reject, or improve that prediction.

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Student-friendly explanation

Science grows by making predictions and then checking them against evidence. If the result does not match, a good scientist does not hide the mismatch. The idea, method, or assumption is checked again. This habit makes science self-correcting and different from blind belief.

How to write this in exams

  1. 1

    Start with the exact idea

    A scientific prediction is a testable expected result, and evidence is the observation or data used to support, reject, or improve that prediction.

  2. 2

    Then show how to use it

    Make a testable prediction, collect fair observations, compare results with the prediction, accept support only when data matches, and revise when it does not.

  3. 3

    Add one concrete example

    If a student predicts that more sunlight will increase plant growth, the evidence may be measured plant height under different light conditions.

  4. 4

    Avoid this incomplete answer

    Wrong answer: Change the readings so the prediction looks correct. This is wrong because scientific conclusions must follow evidence.

Definition

A scientific prediction is a testable expected result, and evidence is the observation or data used to support, reject, or improve that prediction.

Example

If a student predicts that more sunlight will increase plant growth, the evidence may be measured plant height under different light conditions.

Rule to remember

Rule: prediction must be testable, and evidence should decide whether the prediction is supported or revised.

Memory hook

Prediction is a promise to test; evidence gives the result.

Examples and method

Worked example

Prediction: salt dissolves faster in warm water. Evidence: record dissolving time in cold and warm water. If warm water takes less time in repeated trials, the prediction is supported.

Method to apply

Make a testable prediction, collect fair observations, compare results with the prediction, accept support only when data matches, and revise when it does not.

Diagram support

A flowchart can show prediction, test, evidence, comparison, and revision.

How CBSE asks it

Students may be asked to choose the best conclusion from data, identify whether evidence supports a prediction, or suggest a revised prediction.

Avoid common mistakes

Common confusion

Students may think a prediction is correct because it sounds logical, even when the recorded data does not support it.

Common wrong answer

Wrong answer: Change the readings so the prediction looks correct. This is wrong because scientific conclusions must follow evidence.

Exam tip

When evidence disagrees with a prediction, write that the prediction needs revision instead of forcing the data to fit.

Quick check

What should a student do if experimental evidence does not support the prediction?

The student should recheck the method and revise the prediction or explanation according to the evidence, instead of changing the data unfairly.

Answer writing and exam use

1-mark answer

A scientific prediction is a testable expected result, and evidence is the observation or data used to support, reject, or improve that prediction.

2-mark answer

A scientific prediction is a testable expected result, and evidence is the observation or data used to support, reject, or improve that prediction. Rule: prediction must be testable, and evidence should decide whether the prediction is supported or revised. If a student predicts that more sunlight will increase plant growth, the evidence may be measured plant height under different light conditions.

3-mark answer

Science grows by making predictions and then checking them against evidence. If the result does not match, a good scientist does not hide the mismatch. The idea, method, or assumption is checked again. This habit makes science self-correcting and different from blind belief. Rule: prediction must be testable, and evidence should decide whether the prediction is supported or revised. Prediction: salt dissolves faster in warm water. Evidence: record dissolving time in cold and warm water. If warm water takes less time in repeated trials, the prediction is supported. Students may be asked to choose the best conclusion from data, identify whether evidence supports a prediction, or suggest a revised prediction. Wrong answer: Change the readings so the prediction looks correct. This is wrong because scientific conclusions must follow evidence.
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