Give two examples for the following.
(a) Fast changes
(b) Desirable changes
(c ) Non-periodic changes
(d) Physical changes
(e) Chemical changes

Explanation

(a) Burning of a match stick, glowing of an electric bulb.
(b) Formation of curd from milk, formation of manure.
(c ) Sneezing, rusting of iron.
(d) Melting of ice, evaporation of water.
(e) Germination of seeds, cooking of food.