Water Pollution

Q.

Which of the following statement is the incorrect reason for eutrophication?

(A) excess usage of fertilisers

(B) excess usage of detergents

(C) dense plant population in water bodies

(D) lack of nutrients in water bodies that prevent plant growth

1. (D) only

2. (C) only

3. (B) and (D) only

4. (A) only

Q. is the wettest place on earth.

1. Cherrapunji
2. Cropp River
3. Sahara

Q.

What is known as the Scourge of water bodies?

Q.

What are the various effects of water pollution and name any three diseases that are caused due to consumption of polluted water?

Q.

The amount of oxygen dissolved in water increases due to increased water pollution.

1. True

2. False

Q.

How does overuse of fertilisers make the soil porous and why is that harmful?

Q.

Give one word for :

Overgrowth of aquatic plants on the surface of water bodies.

Q. Question 7
Which of the following is not true for fertilizers?

(a) They increase the yield.
(b) Their excessive use disturbs the balance of nutrients in soil.
(c) They are generally used in small quantity.
(d) They are environment friendly.

Q.

What are 2 types of eutrophication?

Q. Out of all the water present on the Earth, is freshwater.

1. 25%
2. 2.5%
3. 10%
4. 15%

Q.

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

1. Sewage waste

2. Chlorination of water

3. Industrial waste

4. Automobiles

Q. Which of the following activities does not result in water pollution?

1. Sewage disposal
2. Disposal of dead animals into rivers
3. Industrial discharge of gases such as carbon dioxide
4. Fertilisers and pesticides from the agricultural fields

Q.

What are water pollutants? [2 MARKS]

Q.

Question 3
Clear, transparent water is always fit for drinking. Comment.

Q. List the practices which are not environment friendly and why?

Q.

Define Eutrophication.

Q.

What are different ways by which water gets polluted?

Q.

Question 11
Why does the increased level of nutrients in the water affect the survival of aquatic organisms?

Q.

Question 18
Name any two water pollutants which are toxic for plants and animals.

Q.

Write any three use of water in our daily life.

Q.

Deficiency of fluorine results in

1. Both (A) and (C)

2. C. Tooth decay

3. B. Goitre

4. A. Fragile nails

Q. Which of the following chemical elements is added to water kill microbes?

1. Chlorine
2. Fluorine
3. Arsenic
4. Lead

Q. In the waste treatment plant (WWTP) air is pumped into water to:

1. Support the growth of anaerobic bacteria
2. Support the growth of aerobic bacteria
3. Inhibit the growth of anaerobic bacteria
4. Inhibit the growth of aerobic bacteria

Q.

What happens during eutrophication?

Q. What causes eutrophication in water bodies?

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

Q. On the basis of pollutants and mediums of pollution, environmental pollution can be classified into which of the following types?

1. Air pollution, water pollution, soil pollution and space pollution
2. Air pollution, water pollution, earth pollution and fire pollution
3. Air pollution, water pollution, soil pollution and noise pollution
4. Air pollution, water pollution, soil pollution and fire pollution

Q. ___________ pollution is the release of any kind of heated gases or heated water into the environment.

1. Noise pollution
2. Air pollution
3. Water pollution
4. Thermal pollution

Q. Which of the following ailments cannot be caused by drinking contaminated water?

1. Hepatitis
2. Tuberculosis
3. Bone deformity
4. Typhoid

Q. The great pacific garbage patch is bigger than many countries.

1. False
2. True

Q. State whether the following statements are true or false:​
Statement 1: In land fallowing method different crops are grown alternately.​
Statement 2: Rhizobium fixes atmospheric oxygen.​

1. Statement 1: False; Statement 2: False​
2. Statement 1: False; Statement 2: True​
3. Statement 1: True; Statement 2: True​
4. Statement 1: True; Statement 2: False​