Eutrophication is often seen in

1. fresh water lakes

2. ocean

3. mountains

4. deserts

A renewable exhaustible natural resource is 

1. coal

2. petroleum

3. minerals

4. forest

dB is a standard abbreviation used for the quantitative expression of

1. the density of bacteria in a medium

2. a particular pollutant

3. the dominant Bacillus in a culture

4. a certain pesticide

The two gases making highest relative contribution to the greenhouse gases are

1. CO₂ and CH₄

2. CH₄ and NO₂

3. CFCs and N₂0

4. CO₂ and N₂0

Chipko movement was launched for the protection of

1. grasslands

2. forests

3. liverstock

4. wet lands

DDT residues are rapidly passed through food chain causing biomagnification because

DDT is :-

1. lipid soluble

2. moderately toxic

3. non-toxic to aquatic animals

4. water soluble

Steps taken by the Government of India to control air pollution include

1. compulsory mixing of 20% ethyl alcohol with petrol and 20% biodiesel with diesel

2. compulsory PUC (Pollution Under Control) certification of petrol driven vehicles, which

tests for carbon monoxide and hydrocarbons

3. permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for

vehicles

4. use of non-polluting Compressed Natural Gas (CNG) only as fuel by all buses and

trucks

Montreal protocol aims at
1. reduction of ozone depleting substances
2. biodiversity conservation
3. control of water pollution
4. control of CO₂ emission

Global agreement in specific control strategies to reduce the release of ozone depleting

substances, was adopted by

1. Rio de Janeiro Conference

2. The Montreal Protocol

3. The Koyoto Protocol

4. The Vienna Convention

A lake near a village suffered heavy mortality of fishes within a few days. Consider the

following reasons for this

(1) Lots of urea and phosphate fertilizer were used in the crops in the vicinity.

(2) The area was sprayed with DDT by an aircraft.

(3) The lake water turned green and stinky.

(4) Phytoplankton populations in the lake declined initially thereby greatly reducing

photosynthesis.

Which two of above were the main causes of fish mortality in the lake?

1. 2, 3

2. 3, 4

3. 1, 3

4. 1, 2