CBSE Class 3 · Science
Taking Charge of Waste
Official NCERT chapter from Our Wondrous World (book code ceev1). ExamMaster notes are original teaching at CBSE Class 3 depth.
This lesson follows the official chapter “Taking Charge of Waste” in Our Wondrous World. The words below are ExamMaster’s teaching, not a paste from the book. Use the NCERT chapter for the classroom sequence; use these notes to hold the idea without copying exercises or figures.
- CBSE Class 3
- Easy level
- 8 concepts
1Waste is leftover after a use, not “away”
A banana peel after eating is leftover. “Away” is not a place that makes it vanish. It still sits somewhere.
Hiding it under a desk does not end the leftover.
Figure. Waste is what is left after a use. Eating the banana leaves a peel; that peel still sits somewhere. Away is not a place that makes leftover vanish.
How it works
- Name the useEating the banana.
- Name what is leftThe peel.
- Call that wasteIt is not gone.
2National Cleanliness Day is a job, not a date-only poster
A date on a poster is a reminder. The job is to sort and place waste. A date without the job is a poster only.
You can do the job on any day.
Figure. A date on a poster is a reminder. Cleanliness is the job: sort waste and put it in the right place. You can do that job on any day; reading the date is not the job.
How it works
- See the reminderA date or a notice.
- Do the cleanliness jobSort, bin, do not litter.
- Do not stop at reading the dateThe job is the point.
3Sort waste by a test: wet, dry, sharp, reusable
Wet food leftover, dry paper, a sharp tin edge, a jar you can wash and keep — those are different tests. Sort before you dump one pile.
One mixed bag hides the tests.
Figure. Sort one leftover at a time. Wet food, dry paper, a sharp edge, and a jar you can wash each fail or pass a different test. One mixed bag hides the tests.
How it works
- Pick one leftoverThis piece.
- Run wet / dry / sharp / reusableOne label.
- Put it in that sortThen the next piece.
4A bin is a place; a dump is a different place
The classroom bin is a collected place. A dump is a later place. Throwing past the bin onto the yard skips the first place.
“I threw it” without a place-name is incomplete.
Figure. A classroom bin is the first collected place. A dump is a later place. Throwing past the bin onto the yard skips the first place. Name the place, not only the throw.
How it works
- Name the first placeThe right bin.
- Put the leftover thereCollected.
- Do not skip to the yardThe yard is not the bin.
5Reduce, reuse, and recycle are three different jobs
Reduce: use less in the first place. Reuse: use the same object again. Recycle: send a material to be made into something new. Three jobs, three words.
Saying all three as a chant without picking one job is a slogan.
Figure. Reduce means use less next time. Reuse means use the same object again. Recycle means send a material to be made into something new. Pick the job that fits this leftover; do not chant all three as one.
How it works
- Pick one leftoverThis jar, this bag.
- Ask which job fitsLess next time; wash and keep; or send as material.
- Do that one jobDo not chant all three as if they were one.
7One schoolyard case
One peel, one wrapper, one sort into the right bin is a finished case. You do not need a city’s landfill tour.
A yard case you did is stronger than a slogan about the nation.
Figure. One leftover in the yard, one sort, one matching bin is a finished case. You do not need a city's landfill tour. A case you did is stronger than a slogan about the nation.
How it works
- Pick one leftover in the yardThis wrapper.
- Sort itDry, or wet…
- Place it in the matching binThe case.
8A miss: hiding waste so it is no longer waste
Under a desk or in a drawer, it is still leftover after a use. Hidden is not gone.
The miss is treating “I cannot see it” as “it is not waste”.
Figure. Hidden leftover is still leftover after a use. Under a desk it is waste in the wrong place — litter you cannot see. Seeing is not the test; leftover and place are.
How it works
- Ask if it is leftover after a useYes: still waste.
- Ask if it is in the right placeBin, or not.
- If hidden in the wrong place, it is still waste — and litterSeeing is not the test.
A peel under a desk is
- Still waste, and in the wrong place
- Gone, because hidden
- A material called steel
Hidden is not away.
Notes
- Mapped to the official NCERT chapter “Taking Charge of Waste”. Original teaching only — no textbook sentences.
- Science here is Physics, Chemistry and Biology ideas at this class, never a language or social-science chapter.
Recap
Hold these pegs from the official chapter “Taking Charge of Waste”. The wording is ExamMaster’s teaching, not a textbook recap.
- Waste is leftover after a use, not “away”
- A banana peel after eating is leftover. “Away” is not a place that makes it vanish. It still sits somewhere.
- National Cleanliness Day is a job, not a date-only poster
- A date on a poster is a reminder. The job is to sort and place waste. A date without the job is a poster only.
- Sort waste by a test: wet, dry, sharp, reusable
- Wet food leftover, dry paper, a sharp tin edge, a jar you can wash and keep — those are different tests.
- A bin is a place; a dump is a different place
- The classroom bin is a collected place. A dump is a later place. Throwing past the bin onto the yard skips the first place.
- Reduce, reuse, and recycle are three different jobs
- Reduce: use less in the first place. Reuse: use the same object again. Recycle: send a material to be made into something new. Three jobs, three words.
- Litter fails the job of keeping a shared place usable
- A peel on the stairs makes the shared place worse to use.
Practise Taking Charge of Waste
Reading is free and needs no account. Practice, mocks and progress live in the app.
- A 4-question practice set that ends the chapter
- 1 quick check with worked explanations
- Timed mocks scored with the real marking scheme
- Readiness tracked per topic, kept on your device