Question

desirable changes defination

Answer 1

Desirable changes are those changes which we want to occur. These changes are useful for us. For example : ripening of fruits , germination of seeds , change in season etc. Non desirable or Undesirable changes are those changes which we do not want to take place.

hope it will help you

Answer 2

Favourable changes. It means that what we want to change.
According to your desires.