Ans. Germination of seed and ripening of fruits
Ans. Bursting of crackers and Burning of paper
Ans. No, because it is an irreversible change.
Ans. Yes, the shape of the eraser changes when it is used repetitively.
Ans. Growth of nails, growth of hair, increase in height, increase in weight etc.
Ans. Yes, it can be reversed. Another example is ball made by folding paper.
Ans. No, this change is not reversible as broken pieces cannot be fixed.
Ans. Molten wax is poured in desired mold and a wick is placed in it. Then it is cooled. This is how we get candles of different shape.
Ans. The changes in which we can bring back the products to original form without creating any new substance are known as reversible changes.
Ans. No, cutting down of tree cannot be consider as a reversible change because same tree can be planted again after cutting.
Ans. Printing is an irreversible change because ink and paper cannot be separated once printing is done.
Ans. Reversible Change – melting of ice and stretching of rubber band
Irreversible change – Burning of leaves and Souring of milk
Ans. No, this change cannot be reversed as we cannot get fresh blank sheet once a picture is drawn and colored.
Ans. Explosion of a cracker is an irreversible change because once crackers are burnt, they cannot be converted back to its original form.
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