medium difficulty7 min

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.

In one line: Prediction is a promise to test; evidence gives the result.

Practice This Concept

Understand it

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.

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.

See it worked out

Follow the example line by line, then use the same method on new questions.

Worked example

Prediction: salt dissolves faster in warm water.

1Evidence: record dissolving time in cold and warm water.
2If warm water takes less time in repeated trials, the prediction is supported.

Method you can reuse

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

Visual tip

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

Check yourself

Answer the question in your head before opening the answer.

Try it yourself

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

Think first, then show answer

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

Common wrong answer

Change the readings so the prediction looks correct.

Why it loses marks: Scientific conclusions must follow evidence.

Don't mix this up

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

Exam tip

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

Write it in the exam

Each point is worth about one mark. Write point 1 for a 1-mark question and keep adding points as the marks go up.

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.

1
Enough for 1 mark
A scientific prediction is a testable expected result, and evidence is the observation or data used to support, reject, or improve that prediction.
2
Add for 2 marks
Science grows by making predictions and then checking them against evidence.
3
Add for 3 marks
If the result does not match, a good scientist does not hide the mismatch.

MCQ Quiz

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