Water Pollution

Q.

What are pollutants?

Q.

Eucalyptus trees are planted all along sewage ponds because these trees absorb the surplus waste water rapidly and release pure water vapour into the atmosphere.

1. True

2. False

Q.

How does biodiversity affect the environment?

Q.

How does the river get polluted?

Q.

Which is the wettest place in Tamilnadu ?

Q.

The diseases like diarrhoea, typhoid, cholera, dysentry and jaundice are called ___.

1. air borne diseases
2. mosquito borne diseases
3. none of the above
4. water borne diseases

Q. Name the source of carbon dioxide for aquatic plants.

Q. List two main causes of the pollution of water of the river Ganga. State how pollution and contamination of river water prove harmful for the health of the people of neighbouring areas.

Q.

Nonpoint source pollution is more difficult to control than the point source water pollution.

1. True

2. False

Q.

Name any four chemical pollutants of the water.

Q.

Why should plastic bags and containers not be disposed of by burning?

Q.

What is pollution?

Q.

HEALTH HAZARDS OF MODERNIZATION

Q. Which of the following is not a pollutant?

1. Emission from cars
2. Chemical fertilizers sprayed on plants
3. A weed in a crop field
4. Oil in a tanker

Q. Which of the following statements does not apply to eutrophication?

1. It is the natural aging of a lake by nutrient enrichment of its water
2. In a young lake, the water is cold and clear and supports less life
3. The nutrients such as sulphur and phosphorus encourage the growth of aquatic organisms in the lake
4. Pollutants released by man radically accelerate the aging process of a lake.
5. Overgrowth of algae leads to scum that depletes the level of dissolved oxygen in water

Q. Hot water discharged by the industries into water bodies does not affect the aquatic animals.

1. True
2. False

Q.

Most of the impurities in water are not visible to the naked eye.

1. True
2. False

Q.

If untreated sewage is discharged into rivers and seas, it will clean the water resources.

1. True

2. False

Q.

Sewage and toxic chemicals are water pollutants.

1. True
2. False

Q. Mention whether the following statements are True (T) or False (F).
(v) Hot water discharged into water bodies hardly affects the fish and other aquatic life. (T/F)

Q.

____________ spreads water-borne diseases such as typhoid, cholera and jaundice.

Q.

Name any three waterborne diseases.

Q. Name any two common water-borne diseases.

Q.

Fresh water if consumed may result in waterborne diseases including viral hepatitis, typhoid, cholera, dysentery and diarrhoea.

1. True

2. False

Q.

__________is caused due to accidental discharge of petroleum products into the water bodies.

1. Soil pollution

2. Industrial pollution

3. Thermal pollution

4. Oil spill

Q. Industrial waste and effluents discharged into rivers by industries cause water pollution.

1. True
2. False

Q.

If untreated sewage is discharged into rivers and seas, it will ____ these water resources.

1. nourish

2. pollute

3. heat

4. cool

Q. State whether true or false:
Most of the impurities in water are not visible to the naked eye.

1. True
2. False

Q.

'Flocks' is

1. The primary sludge produced in sewage treatment

2. A type of biofortified food

3. A mesh-like structure formed by the association of bacteria and fungal filaments in sewage treatment

4. The effluent in primary treatment tank obtained during sewage treatment

Q. What are some health hazards caused by water borne diseases?