Grade 9 Science, Explained
Nepal’s Grade 9 Science and Technology curriculum, unit by unit in the order of CDC’s textbook, said clearly, with examples to work out, diagrams to play with, and a few surprises. For students with any Grade 9 science book.
Exam practice: every question in the book →
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- Unit 1 Scientific Study Science is a careful way of finding things out, with numbers that reach from an atom to the Sun. Science and research
- Unit 2 Classification of Living Beings There are millions of kinds of living things. Sorting them into groups lets us name them, study them and understand them. Living things
- Unit 3 Mushroom A mushroom is neither a plant nor an animal: a hidden web that feeds on dead things, and a food we can grow. Living things
- Unit 4 Evolution Living things have changed over millions of years, and fossils, our own bodies and the life around us show how. Living things
- Unit 5 Body Structure and Life Process Plants and animals are built of tissues working together, and nerves and hormones keep every part in step. Living things
- Unit 6 Nature and Environment Every living thing depends on others and on its surroundings, so a change in one place spreads through the whole. Living things
- Unit 7 Force and Motion Why things start, stop and turn: three laws explain every push and pull around us. Physics
- Unit 8 Simple Machine A simple machine never gives back more work than we put in, but it lets a small force do a big job. Physics
- Unit 9 Energy Nearly all the energy we use began as sunlight. Where does Nepal's come from, and how can we use it better? Physics
- Unit 10 Wave Light, sound and radio are all waves, carrying energy and messages without carrying matter along. Physics
- Unit 11 Electricity What makes a current flow through a wire, and how it lights, heats and runs our homes. Physics
- Unit 12 The Universe Stars are born, shine and die, and the universe they live in had a beginning. Earth and space
- Unit 13 Information and Communication Technology Signals travel through the air and through space to connect the world. How do they work, and how do we use them wisely? Technology
- Unit 14 Atomic Structure and Chemical Bond Everything is built of atoms, and how their outer electrons are passed or shared decides how they join. Chemistry
- Unit 15 Chemical Reaction In a chemical reaction no atom is made or lost: the same atoms are rearranged into new substances. Chemistry
- Unit 16 Gases Hydrogen, oxygen and nitrogen are invisible, yet life can't do without them. And how the world saved the ozone layer. Chemistry
- Unit 17 Metals and Non-metals Metals and non-metals behave in opposite ways, and that decides what each is good for, and what harms us. Chemistry
- Unit 18 Carbon and its Compounds One element, carbon, makes diamonds, the lead of a pencil and every living thing. Chemistry
- Unit 19 Materials used in Agriculture Plants need food too. Feeding the soil well gives good harvests without poisoning the land. Chemistry
How to use this book
Each unit covers its part of the curriculum in the order of CDC’s textbook, whose page numbers are under each unit’s title; whichever book your school uses, you can read it alongside. Inside you’ll find:
- Worked examples: try them first; the answer stays hidden until you open it.
- Try it questions and each unit’s questions at the end, with hints and answers to open when you’re ready.
- Diagrams to play with: drag, slide and change things to see what happens.
- Did you know? boxes with the stories and surprises behind the science.
A companion to your textbook, not a replacement: study from the book your school uses, and where the two differ, follow your teacher. Every fact here has been checked against the textbook and other reliable sources, but these pages have not yet been reviewed by subject experts. If you find a mistake, please tell us.