Contamination of water bodies from human activities changes their physical, chemical, and biological properties and harms aquatic organisms. Water contamination occurs through direct dumping of wastes as well as agricultural and household runoff. Toxins from contaminated water can kill both fish and humans, and lead to algal blooms and red tides. Contaminated water can also spread diseases in humans such as dysentery, typhoid fever, cholera, and other viral and parasitic diseases when consumed. Preventing water contamination through proper waste disposal, organic farming, avoiding plastics, boiled water and food, hand washing, and environmental cleanliness is important to protect both aquatic life and human health.

1. BY MALAVIKA PRABHAKARAN

3.  Now we are depending on this

4.  Contamination of water bodies - change in
physical, chemical and biological properties
of water.
 caused due to human activities.
 Major impact to the aquatic organisms.

5.  Physical
plastics,e-waste,insecticides,etc.
 Chemical
 Biological- algal blooms, animal excretory
wastes etc.

Dangering species of ocean – P.bagfish

7.  Direct source – directly dumping wastes into
water bodies.

8.  Agriculture run off, acid rain wet deposition,
house wastewater runoff

10.  Toxin-kill organisms both fish
and humans.
 ‘Science In life of pi’
Red tides & Brown tides-
Nitrates and phosphorous
algae reproduce

12.  From Human or animal waste in water.
 Caused due to the drinking of contaminated
or dirty water.
 Disease- Dysentery.
Typhoid fever.
Cholera.
Viral diseases.
Parasitic diseases.
Water-washed disease.

13. Disease Causative organism Symptoms
Dysentery Bacteria or protozoa
[ pollute water drink]
Inflammation of intestines,
impairing nutrient absorption,
bleeding, bacterial infection
Typhoid fever Salmonella typhi
bacteria .
[eating contaminated
food ]
High fever, stomach pains, joint
pain , headache, loss of
appetite.

14. Disease Causative organism symptoms
cholera Vibrio cholerae
bacteria .
[Contaminated
water]
diarrhea, fever , vomiting etc.

15. Hepatitis
Encephalitis
Poliomyelitis
Virus – HAV,
Contaminated
water.
Virus – bite of
infected culex
mosquito , lay eggs
in contaminated
water.
Poliomyelitis virus
Infect liver- fever, vomiting,
jaundice, dark urine etc.
Headache, high fever , coma
and paralysis.
Sore throat, fever, diarrhea etc.

17. Cryptosporidiosis Cryptosporidium
parvum
diarrhea, loose or watery
bowls, upset stomach.

18. Galloping amoeba E. histolytica water diarrhea, fever etc

19. Giardiasis Giardia lamblia Watery diarrhae and
weight loss.

20.  Inadequate supply of clean water for washing
and cleaning
 Trachoma and Shigella

21.  clean your environment
 Don’t put the waste here and there
 Boiled food and water
 Organic farming
 Avoid the use of plastics.
 Wash your hands.
‘Prevention is better than cure’