Causes of Water Pollution

Q. Explain the process of eutrophication.

Q.

What can we do to stop eutrophication?

Q.

Write the correct words by rearranging letters in correct sequence -

i) asgewe ii) ratsoncivnoe

Q.

Statement A: Addition of hot water in water bodies is considered as water contamination.
Statement B: Change in the temperature of water in the water bodies doesn't affect aquatic life.

1. Only Statement B is true

2. Both Statement A and Statement B are true
3. Both Statement A and Statement B are false

4. Only Statement A is true

Q.

Water contamination leads to death of aquatic species because ___ .

1. it lowers the pressure of water

2. contaminated water contains bacteria

3. it decrease temperature of water

4. it purifies the water

Q.

In which of these eutrophication is seen?

1. Deserts

2. Freshwater lakes

3. Oceans

4. Mountains

Q.

Identify the foul practice(s) by which we have been damaging the Ganga river.

1. Throwing large quantities of garbage

2. Pushing untreated sewage

3. Cremation of dead bodies

4. Taking bath on the banks

Q.

Water contamination leads to death of aquatic species because:

1. it lowers the pressure of water

2. it decrease temperature of water

3. contaminated water contains bacteria

4. it purifies the water

Q.

Untreated sewage contaminates Ganga because it ____

1. it contains micro-organisms

2. it lowers the pressure of water

3. it increases the buoyancy of water

4. it makes the water dense

Q. Sewage waste contains mainly water.

1. False
2. True

Q. Contamination is:

1. process of removing harmful substances

2. process of adding vital minerals

3. process of killing germs and microorganisms

4. addition of harmful substances

Q.

Water pollution can be potentially harmful to aquatic life. What are the various sources of water pollution?

1. Sewage wastes

2. Chlorine water

3. Industrial wastes

4. Both sewage and industrial wastes

Q. The Great Pacific Garbage Patch has been created due to extensive water.

1. decontamination
2. pollution
3. purification

Q. Dumping untreated sewage into water leads to:

1. water conservation
2. water filtration
3. water contamination
4. air contamination