Question

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Write 5 Desirable / useful changes
Write 5 Undesirable / harmful changes
Write 5 reversible / temporary changes
Write 5 Irreversible / permanant changes
Write 5 Physical / mostly reversible changes
Write 5 chemical / mostly irreversible changes

Class :- 7th

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Answer 1

Answer:

Desirable changes

-rain bringing water to the crops, milk changing into curd, ripening of seedlings of fruits into a plant and bees changing nectar into honey

Undesirable

-burning of plastic, burning fossil fuels, deforestation, souring of milk and Rain causing destruction by floods

Reversible

-Melting of ice.

Boiling of water.

Melting of wax.

Stretching of a rubber band.

Stretching of a spring.

Inflation of a balloon.

Irreversible

-burning of fuel, cooking of food, souring of milk, making dough from dry wheat flour and burning of wood.

Physical / mostly reversible changes

-melting, freezing, folding and boiling, stretching

chemical / mostly irreversible changes

-piece of iron is cast into different shape, tearing paper, burning

Answer 2

Answer:

Desirable changes are the one which are brought about by nature and results produced by these changes are good results or useful results. Example: rain bringing water to the crops, milk changing into curd, ripening of seedlings of fruits into a plant.