The changes that we want to take place are desirable changes. For living beings such changes are beneficial. [1 Mark]
Examples: Germination of seeds, ripening of fruits, change in season [1 Mark]
The changes that we would not want to occur are non-desirable or undesirable changes. [1 Mark]
Examples: Souring of milk, rusting of iron, rotting of fruits & vegetables, global warming [1 Mark]