DESIRABLE AND UNDESIRABLE CHANGES
• Some changes are useful to us and we want them to take place. Such changes are called desirable changes.
• We want the plants to grow, the fruits to ripen, wet clothes to dry and food to be cooked.
• Some changes are harmful to us and we don’t want them to happen. These are called undesirable changes.
• Accidents, disasters, spoiling of food are some undesirable changes.
• Some changes are desirable at some times but undesirable at other times.