Page 111 - EVS Class 04
P. 111
D. Explain each in two sentences.
1. Chlorination : ____________________________________________________
______________________________________________________________________
2. Filtration : ___________________________________________________________
______________________________________________________________________
3. Boiling : ____________________________________________________________
_____________________________________________________________________
E. Choose the correct option for the following.
1. This makes water of the water bodies polluted.
a) Rain b) Washing
c) Garbage disposal d) Both b) & c)
2. Which of these is a cause of water pollution?
a) Bathing animals b) lmmersion of idols
c) Dumping of wastes d) All of these
3. This disease is not caused by drinking impure water.
a) Malaria b) Jaundice
c) Typhoid d) None of these
4. How can we clean water?
a) By boiling b) By adding chlorine tablets
c) Both a) & b) d) None of these
A. Visit a water-treatment plant. Observe the different steps of water
purification.
B. Make a list of different types of water filters available in the market. Note
their special features. Find out which is the most popular filter and why?
C. Write a note on ‘Conservation of Water’.
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
EVS-4
111
