Question

what are desirable or undesirable changes mention one example each

Answer 1

Undesirable change: The changes which are not desired to change is called undesirable changes. Desirable changes are those that are beneficial[useful].Milk changing into curd,a seed germinating and forming a new plant and bees changing nectar into honey are some examples of desirable change.

Answer 2

1.Desirable Changes: Those changes which are desired to occur that is, we want them to take place are known as desirable changes.

Examples: ripening of fruits, germination of seeds etc.

2.Undesirable change: Those changes which we do not want to take place are called undesirable changes.

Examples: rusting of iron, souring of milk, rottening of fruits etc.

Hope it helps. ...