Effect of Sewage on Water Bodies

Q.

What are water-borne diseases? How are they caused? Name any two such diseases.

Q. Assertion [A]: Eutrophication shows an increase in productivity of water.
Reason [R]: With increasing eutrophication, the diversity of phytoplankton increases.

1. Both A and R are true and R is the correct explanation for A
2. Both A and R are true but R is not the correct explanation for A
3. A is true but R is false
4. Both A and R are false

Q. The high value of BOD (Biochemical Oxygen Demand) indicates that:

1. Consumption of organic matter in the water is higher by the microbes
2. Water is pure
3. Water is highly polluted
4. Water is less polluted

Q.

All the following are waterborne diseases except

1. Typhoid

2. Dysentery

3. Cancer

4. Amoebiasis

Q.

Dumping of large quantities of biodegradable pollutants in a stream, leads to undesirable growth of microorganisms and plankton. This phenomenon is called

___.

1. Oligotrophication

2. Eutrophication

3. Biological oxygen demand

4. Dissolved oxygen

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

1. True
2. False

Q. The presence of coliform bacteria is an indication that the water is

1. unfit for drinking
2. unfit for gardening
3. unfit for bathing
4. unfit for washing cars

Q. Arrange the following options in ascending order of their BOD value:

(I) Sample of highly polluted pond water
(II) Sample of unpolluted pond water
(III) Distilled water

1. III - I - II
2. II - III - I
3. III - II - I
4. I - III- II

Q.

Match the pollutants listed in column I with the respective diseases mentioned in column II:
$\begin{array}{cccc}& Column-IPollutants& & Column-IIDiseases\\ A& S{O}_x& e& Hypoxaemia\\ B& Domesticsewage& f& Bronchitis\\ C& Mercury& g& Minamatadisease\\ & & h& Amoebicdysenetry\end{array}$

1. A - f, B - h, C - g

2. A - e, B - f, C - g

3. A - h, B - g, C - f

4. A - g, B - e, C - h