River Pollution

Q.

Eutrophication causes a reduction in:

1. Nutrients

2. Dissolved salts

3. Dissolved oxygen

4. All of these

Q. What causes eutrophication in water bodies?

1. Excess amount of oil spilling into the water body.
2. Excess amount of fertilisers getting drained into water.
3. Change in the pH level of water.
4. Decreased level of oxygen.

Q. Eutrophication causes decrease in which of the following?

1. Dissolved hydrogen
2. Dissolved oxygen
3. Dissolved nitrogen
4. Dissolved salts

Q. Eutrophication is the increased growth of algae in water that results in reduced sunlight penetration and depletion of dissolved in water.

1. oxygen
2. nitrogen
3. argon
4. carbon dioxide

Q. What are the reasons for the pollution of rivers? How can it be prevented?

Q. What is eutrophication?

1. Increase in levels of oxygen in water bodies
2. Reduction of nutrients in water bodies
3. Increase in sunlight penetration
4. Decrease in levels of oxygen in water bodies

Q.

Eutrophication is often seen in __________.

1. freshwater lakes

2. ocean

3. mountains

4. deserts

Q. PCBs stand for which of the following?

1. Polychloride biphenyls
2. Polychlorinated bisphenols
3. Polychloride bisphenols
4. Polychlorinated biphenyls

Q. Pollution in rivers like the Ganga is caused by which of the following factors?

1. Louder noise.
2. Dumping of industrial waste into rivers.
3. Releasing treated sewage into rivers.
4. Transportation.

Q. What causes eutrophication in water bodies?

1. Excess amount of oil spilling into the water body.
2. Excess amount of fertilisers getting drained into water.
3. Change in the pH level of water.
4. Decreased level of oxygen.