Photosynthesis is a _________ change.

A chemical change is also called __________.

Burning of wood is a _________ change.

________ protects us from the harmful ultraviolet radiation.

Chemical changes are  ___________. 

__________ burns with a brilliant white light.

The process of depositing a layer of zinc on iron is called __________.

Germination of seeds is a _________. 

The formation of rust on the surface of iron is called __________ of iron. 

A change in which a substance undergoes a change in its physical properties is called a ________ change.