Measuring Biochemical Oxygen Demand (BOD) is a method used for

1. estimating the amount of organic matter in sewage water

2. working out the efficiency of oil driven automobile engines

3. measuring the activity of Saccharomyces cerevisae in producing curd on a commercial

scale

4. working out the efficiency of RBCs about their capacity to carry oxygen

Increase in concentration of the toxicant at successive tropic levels is known as

1. biomagnification

2. biodeterioration

3. biotransformation

4. biogeochemical cycling

High concentrations of accumulated DDT in birds
1. kills pathogens in their blood
2. causes sterility by affecting gametogenesis
3. leads to premature breaking of eggs
4. causes spasticity of the muscles ofthe body

Eutrophication is often seen in

1. fresh water lakes

2. ocean

3. mountains

4. deserts

Match the items given in Column I with those in Column II and select the correct option given below: 

Natural ageing of a lake by biological enrichment of its water is known as:
1. Eutrophication
2. Biomagnification
3. Bioremediation
4. Biofortification

Match the items in column I and column II and choose the correct option :-

The correct match is :-

1. A-ii, B-i, C-iv, D-iii

2. A-iii, B-ii, C-iv, D-i

3. A-iii, B-iv, C-i, D-ii

4. A-iii, B-i, C-iv, D-i

An example of integrated waste water treatment comes from

Which of the following is harmful for aquatic organisms?

Natural ageing of a lake by biological enrichment of its water is called

1.  Biomagnification

2.  Eutrophication

3.  Algal blooms

4.  Toxification