Why do organisms need water?
Organisms need water for
(i) Cellular processes - as all the processes take place in a water medium.
(ii) Transportation of substances - water is used for the transportation of substances from one part of the body to the other.
(iii) Reactions - All the reactions that occur in the cell or body occur between substances dissolved in water.
What is the major source of fresh water in the city / town I village where you live?
Do you know of any activity which may be polluting this water source?
How is soil formed?
What is soil erosion?
