Effect of Sewage on Water Bodies

Q.

Write the causes and effects of water pollution.

Q.

Physical removal of large and small particles from the sewage through filtration and sedimentation is called:

1. Primary treatment

2. Secondary treatment

3. Tertiary treatment

4. Quaternary treatment

Q.

Several factories were pouring their wastes in rivers A and B. Water samples were collected from these two rivers. It was observed that sample collected from river A was acidic while that of river B was basic. The factories located near A and B are:

1. Soaps and detergents factories near A and alcohol distillery near B.

2. Soaps and detergents factories near B and alcohol distillery near A.

3. Lead storage battery manufacturing factories near A and soaps and detergents factories near B.

4. Lead storage battery manufacturing factories near B and soaps and detergents factories near A.

Q.

List two major harmful effects of each of the following :

(i) Rivers contaminated with sewage.

(ii) Too much gaseous exhausts containing $C{O}_{2}andS{O}_2$.

(iii) Pesticides such as DDT used in agriculture.

(iv) Prolonged noise such as the one produced by crackers

Q. When domestic sewage mixes with river water

1. Small animals like rats will die after drinking river water
2. The increased microbial activity releases micro nutrients such as iron
3. The increased microbial activity uses up dissolved oxygen
4. The river water is still suitable for drinking as impurities are only about 0.1%

Q.

What is the phenomenon through which certain pollutants get accumulated in tissues in increasing concentration along the food chain, called?

Q. is the increase in concentration of contaminated substances or toxins up in the food chain.

1. Biomagnification
2. Bioaccumulation
3. Biopollution
4. Eutrophication

Q. A common cause of is the use of water as a coolant by power plants and industrial manufacturers.

1. thermal pollution
2. soil pollution
3. air pollution

Q. A river with an inflow of domestic sewage rich in organic waste may result in :

1. An increased production of fish due to biodegradable nutrients
2. Drying of the river very soon due to algal bloom
3. Increased population of aquatic food web organisms
4. Death of fish due to lack of oxygen

Q.

Are algal blooms harmful to humans?

Q. is the artificial enrichment of an aquatic system by the addition of nutrients.

1. Water pollution
2. Eutrophication
3. Biomagnification

Q. Write the four causes of water pollution and explain the control of water pollution.

Q. What is biological magnification?

Q.

Describe four causes of water pollution.

Q.

Acid rain pollutes water bodies and harms aquatic life.

1. True
2. False

Q. Which of the following cause ground water pollution?

1. Iron
2. Arsenic
3. Chloride
4. Fluoride

Q.

What does waste mangagement means? How can you help in reducing the problem of waste disposal? Give any two methods. [3 MARKS]

Q.

Sewage contains harmful nutrients such as phosphorus and ________.

1. Nitrogen

2. Carbon

3. Both Oxygen and Nitrogen

4. Oxygen

Q.

Why the garbage that includes plant and animal waste smells very bad after few days?

Q. State whether true or false:
Recycling is the only solution for the treatment of e-wastes.

1. Radioactive fall out engulfed Bhopal
2. Thousands of human being died

Q.

write a short note on "methods of managing the garbage we produce in our city".

Q.

In a village in Karnataka, people started cultivating crops all around a lake that was always filled with water. They added fertilizers to their field in order to enhance the yield. Soon they discovered that the waterbody was completely covered with green floating plants and fishes started dying in large numbers. Analyze the situation and give reasons for excessive growth of plants and the death of fish in the lake.

Q. Thermal pollution means

1. Increase in the temperature of water
2. Oxygen depletion
3. Death of aquatic animals
4. All of the above

Q. State whether true or false:
Coliform bacteria are found in the small intestine of humans.

1. True
2. False

Q.

Arsenic and fluoride pollutants are mainly found in _________.

1. Water bodies

2. Soil

3. Air

4. Food products

Q.

define biomagnification &eutrophication?

Q.

Why should we be cautious in disposing of e-waste?

Q. A lake near a village suffered heavy mortality of fishes within a few days. Which of the following statements could be the correct explanation for this?
(i) Lots of urea and phosphate fertilizers were used in the crops in the nearby fields.
(ii) The croplands of the village were sprayed with DDT.
(iii) The lake water turned green and stinky.
(iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.

1. (i) and (iii)
2. (i) and (ii)
3. (ii) and (iii)
4. (iii) and (iv)

Q. What is eutrophication and what are its effects?

Q. Which one of the following is a biodegradable pollutants?

1. Cowdung
2. DDT
3. Lead Vapour
4. Plastic