NCERT Class 8 Science Chapter 1
Exploring the Investigative World of Science
NCERT Class 8 Science Chapter 1 introduces students to the scientific method and how scientists investigate the world around them. This CBSE chapter covers observation, hypothesis, experimentation, and drawing conclusions — the core skills needed throughout the Class 8 Science curriculum. Students learn how curiosity drives discovery and how to think like a scientist.
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Key Terms
- Scientific Method
- A systematic process of investigation involving observation, forming a hypothesis, conducting experiments, and drawing conclusions.
- Hypothesis
- A testable prediction or educated guess made before an experiment to explain an observation.
- Observation
- The act of carefully watching or measuring something using the senses or instruments to gather data.
- Experiment
- A controlled procedure carried out to test a hypothesis and collect evidence.
- Inference
- A logical conclusion drawn from observations and experimental data.
- Variable
- A factor that can change in an experiment; includes independent, dependent, and controlled variables.
- Data
- Facts and figures collected during an investigation that are used to draw conclusions.
Frequently Asked Questions
What is the scientific method Class 8?▾
The scientific method is a step-by-step process scientists use to investigate questions. The steps are: observation, forming a hypothesis, designing an experiment, collecting data, analysing results, and drawing a conclusion. Class 8 NCERT Chapter 1 explains each step with examples.
What is a hypothesis in Class 8 Science?▾
A hypothesis is a testable prediction or possible explanation for an observation. It is formed before conducting an experiment. For example, if you observe that plants near a window grow faster, your hypothesis might be: 'Plants grow faster when they receive more sunlight.'
What is the difference between observation and inference Class 8?▾
Observation is what you directly notice using your senses or instruments (e.g., 'the liquid turned blue'). Inference is the conclusion you draw based on that observation (e.g., 'the liquid is basic'). NCERT Class 8 Chapter 1 clearly distinguishes between the two.
Why is science called an investigative subject?▾
Science is investigative because it relies on questioning, experimenting, and evidence to understand the natural world. Scientists do not accept facts blindly — they test ideas through careful experiments and revise their understanding when new evidence is found.
What are the steps of an experiment Class 8?▾
The main steps are: (1) Identify the problem, (2) Research and observe, (3) Form a hypothesis, (4) Plan and conduct the experiment, (5) Record and analyse data, (6) Draw conclusions, and (7) Communicate results. These steps form the basis of scientific enquiry in CBSE Class 8.
What is a controlled experiment Class 8 Science?▾
A controlled experiment is one where only one variable (the independent variable) is changed at a time while all other variables are kept constant. This ensures that any change observed in the results is due to the variable being tested and not some other factor.
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