A Journey Through Curiosity

Class 7 Science · Chapter 1: The Ever-Evolving World of Science · NCERT Curiosity section

Learn

Welcome back, explorers! Science covers everything, small and large, near and far: tiny cells inside a leaf, the movement of the Sun and stars, the materials in our kitchen and the water flowing underground. This year we keep asking deeper questions: how do things work, why do they happen, and what patterns does nature show?

We start with materials: why are some fruits sour, and why does a haldi stain turn red with soap? Then we light lamps with cells and wires, sort metals and non-metals, and study changes: some can be reversed, like ice melting, and some cannot, like a fruit ripening.

We follow heat as it flows, from an ice cube in a glass to rain on distant hills. We look at our own bodies, which change quickly in the teenage years, and at how animals and plants eat, breathe and move food around. We measure time and speed, play with light and shadows, and end with the dance of the Earth, Moon and Sun that gives us days, seasons and eclipses.

These chapters look separate, but they are connected: an idea in physics may spark a question in biology. Science is not just facts; it is a process of observing, asking, testing and revising. It also brings responsibility: human actions affect nature, and science can help us build a more sustainable world.

Explore: which area of science?

1. Sort each question by the area of science that mainly explores it.

Remember

• Science covers everything, small and large, near and far, and its fields are connected.
• Science is a process of observing, questioning, testing and revising.

Quick check

What does it mean that science is a process?

1. we observe, ask, test and revise our ideas
2. we only memorise facts
3. its answers never change
4. only scientists can do it

Think about it

A paper plane inspired real studies of flight. What everyday object makes you curious, and what would you ask about it?

Practice

Practise with fresh questions at three levels (easy, medium, hard), some answered hands-on, with hints and worked answers. Get 4 of your last 5 right to finish the topic.