The Wonderful World of Science | Science Grade 6 CBSE

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Six words every scientist uses

Doing science is a habit of mind. Tap each term to see what it means and how it fits into the way scientists work.

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The three big ideas

Science is a way of understanding the world, not just a set of facts. You build knowledge by asking questions and checking them against what you actually see and measure.
It begins with curiosity. Why is the sky blue? How do birds fly? Why does a slice of apple turn brown? Every discovery started as a simple “why?” or “how?”.
Anyone can do science – a child watching a line of ants, a farmer noticing which seeds sprout fastest, you noticing why your cycle slows on sand.
If the evidence disagrees with an idea, the idea is changed – not the evidence. That honesty is what makes science powerful.

Observe – use your senses, and tools like a hand lens or a scale, to notice details carefully and accurately.
Ask a clear question – turn a vague wonder into something you can actually check.
Make a hypothesis – a possible answer (a smart guess) that can be tested.
Do a fair test – change one thing at a time and keep everything else the same, so you know what caused any difference.
Record and conclude – write down what happens, then decide whether your guess was right. Repeat to be sure.

Worked example. Riya sees her money plant by the sunny window growing faster than one in a dark corner. How can she test if light is the reason?

Question: does light affect plant growth? Fair test: take two similar plants, give both the same water and soil, keep one in light and one in the dark, and measure their height after two weeks. Light is the only thing she changed, so any difference points to light.

Common mistake: changing several things at once. If Riya also gives the plants different amounts of water in different pots, she can no longer tell whether light, water or the pot caused the change.

Science is everywhere: cooking (heat changes food), medicines, clean drinking water, weather forecasts, buses, mobile phones and electricity all rest on scientific knowledge.
Science has branches. Physics studies motion, light, heat and electricity; Chemistry studies materials and how they change; Biology studies living things; Astronomy studies stars and planets.
Technology applies science to solve real problems – a solar lamp uses physics, a vaccine uses biology, a water filter uses both. Science gives the understanding; technology turns it into useful things.

Where you’ll meet it

Science at work

Weather forecasts

Scientists observe temperature, wind and clouds, then test their models against what actually happens. That is why a forecast can warn farmers and fishermen a day before heavy rain or a cyclone.

Medicines & vaccines

A new medicine is never trusted on a hunch. It is tested carefully on volunteers, and the results are recorded and checked before doctors use it – the fair-test idea, applied to keeping people healthy.

India’s journey to space

The same curiosity that asks “what is on the Moon?” sent India’s Chandrayaan mission to land near the Moon’s south pole in 2023 – built on years of careful physics and engineering.

Check yourself

Competency quiz

Modelled on the competency-based pattern — MCQ, assertion–reason and a case study, testing whether you can use the ideas, not just recall them.

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