Identify the incorrectly matched pair with respect to contamination of water
1. Minamata disease: Mercury
2. Blue baby syndrome: excessive nitrates
3. Black foot disease: excessive arsenic
4. Dental caries: excessive fluoride

Ecological sanitation, also known as ecosan, is a new paradigm in sanitation that
1. eliminates the use of conventional pesticides to decrease environmental insult
2. recognizes human excreta and household waste water as resources that can and are recovered, treated, and reused
3. emphasizes the disposal of solid wastes in sanitary landfill sites
4. emphasizes the need for strict legislation against polluting industries

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

To safeguard our water resources, the Water (Prevention and Control of Pollution) Act, was passed in:

1. 1951
2. 1974
3. 1985
4. 1987

Match each item in Column I with one item in Column II and choose the correct answer from the code given below:

Codes:

What is eutrophication?

1. The nutrient enrichment of lakes and ponds
2. The decrease in the pH of a lake or pond
3. The increase of water temperature of a lake or pond
4. The depletion of nutrients inlakes and ponds

In what way does thermal pollution affect organisms?
1. Lowers the pH of water
2. Interrupts normal physiological pathways
3. Decreases oxygen supply in water
4. Increases oxygen supply in water

Biochemical Oxygen Demand (BOD) may not be a good index for pollution in water bodies receiving effluents from

(1) domestic service

(2) dairy industry

(3) petroleum industry

(4) sugar industry

A lake which is rich in organic waste may result in
1. increased population of aquatic organisms due to minerals

2. drying of the lake due to algal bloom

3. increased population of fish due to lots of nutrients

4. mortality of fish due to lack of oxygen

The highest DDT concentration in aquatic food chain shall occur in 
(1) phytoplankton

(2) seagull

(3) crab

(4) eel