Class 7 Science Chapter 1: The Ever-Evolving World of Science Notes

What is this chapter about?

Chapter 1 welcomes you back to Curiosity after Grade 6. The book is not meant to be a store of facts but an invitation to question, to experiment and to explore the world, from tiny cells inside a leaf to the movement of the Sun and stars. Its page numbers follow a fluttering butterfly and a soaring paper plane, a reminder that simple observations of flight once led to real experiments and, in time, to aircraft.

Science is a process

Science is not only about finding new facts. It is a habit of mind that enjoys curiosity, keeps asking and is comfortable with what we do not yet know. In Grade 7 the questions dig deeper, into how things work, why events turn out as they do and what nature’s patterns can teach us. To answer them we step out of the book, and sometimes out of the classroom, to do activities and experiments. Read more in how science keeps changing.

Connected sciences and our responsibility

The book has chapters from physics, chemistry, biology and earth sciences, but they are all linked: an idea in one field often inspires a discovery, or at least a question, in another. Science is also about responsibility. What people do affects nature and is tied to the society we live in, and science can help us face environmental challenges and build a more sustainable world.

The journey of the year

The chapter takes a quick tour of the book. We begin with materials: why are some fruits sour, and what happens when a haldi stain is washed? Batteries, lamps and wires lead to metals and non-metals, and then to changes, some reversible and some not. We follow heat as it melts an ice cube or a glacier, and water as it evaporates, rains and soaks into the ground. Then come our own growing bodies, life processes in animals and plants, the measurement of time, light and shadows, and finally the Earth, Moon and Sun, with day and night and eclipses. You can already read the notes on heat, time and motion, life processes in animals, life processes in plants, light and the Earth, Moon and Sun.

Happy exploring!

Each chapter builds on what you know and asks you to think like a scientist, and even experiments that confirm what we expect may lead to new questions. The chapter ends with Activity 1.1, Question the Answer: instead of answering questions, you invent creative questions for given answers. Try it in asking questions like a scientist, and find sample answers to every question in the NCERT solutions for Chapter 1.