1. Physical change is  artificialdesirableirreversiblenaturalreversibleundesirable change.

2. The changes which are useful, not harmful to our environment and desired by us are known as desirable changes.

3. Ripening of fruit is a  artificialdesirableirreversiblenaturalreversibleundesirable change.

4. Decaying of fruit is an  artificialdesirableirreversiblenaturalreversibleundesirable change.

5.Rotation of the earth is a  artificialdesirableirreversiblenaturalreversibleundesirable change.

6. The changes which are brought about by human beings are known as  artificialdesirableirreversiblenaturalreversibleundesirable changes.

7. Changes that take place in nature on their own are  artificialdesirableirreversiblenaturalreversibleundesirable changes.

8. Magnet attracts iron needle. This is a  artificialdesirableirreversiblenaturalreversibleundesirable change.

9. Boiling of egg results in an  artificialdesirableirreversiblenaturalreversibleundesirable change.

10. Plants convert carbon-di-oxide and water to starch . This an example of  artificialdesirableirreversiblenaturalreversibleundesirable change.