Question

Indicator of water pollution is
A. E. coli
B. Chlorella
C. Beggiatoa
D. Ulothrix

Answer 1

Hint:The contamination of water due to the addition of harmful waste, toxic substances, faecal matter, industrial and agricultural water is called as water pollution.There can be different reasons for water pollution

Complete answer:
The indicator of water pollution is E. coli.The contamination of water is called water pollution. There can be several reasons for water pollution such as agricultural waste, industrial waste, discharge of gods and goddesses, throwing of garbage into water bodies, waste from households, faecal matter etc.
The traditional methods of checking the water quality are the 'Physico-chemical indicators'. These include factors such as the quantity of dissolved oxygen, nutrients, pH, temperature, salinity, toxicants such as insecticides and herbicides, it also accounts for the amount of metals found in the water.
The other method of checking water pollution or contamination of water includes the direct measures of health of flora and fauna. E. Coli can be used as a water pollution indicator. Coliform bacteria are the group of bacteria that can be used to detect the pollution by faecal matter. For safety, coliform bacteria signifies the use of bacteria in a large amount as compared to other coliform bacteria.

Therefore, the correct answer is option (A) E. coli.

Note: Drinking polluted water can cause several water-borne diseases such as typhoid, cholera, jaundice, diarrhea etc. Thus, to prevent these diseases it is essential that the contaminants from the water must be removed.