Global warming can be controlled by:

1.	Reducing reforestation, increasing the use of fossil fuel.
2.	Increasing deforestation, slowing down the growth of the human population
3.	Increasing deforestation, reduces the efficiency of energy usage.
4.	Reducing deforestation, cutting down the use of fossil fuel.

In an area where DDT had been used extensively, the population of birds declined significantly because:
1. Birds stopped laying eggs
2. Earthworms in the area got eradicated
3. Cobras were feeding exclusively on birds
4. Many of the birds laid eggs, but the eggs did not hatch

Which one of the following is a wrong statement?

Which one of the following pairs of gases are the cause of 'Greenhouse effect'?

1. ${\mathrm{CO}}_2$ $\mathrm{and}$ $\mathrm{CO}$

2. ${\mathrm{CFC}}_{\mathrm{s}}$ $\mathrm{and}$ ${\mathrm{SO}}_2$

3. ${\mathrm{CO}}_2$ $\mathrm{and}$ ${\mathrm{N}}_2\mathrm{O}$

4. ${\mathrm{CO}}_2$ $\mathrm{and}$ ${\mathrm{O}}_3$

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 the highest relative contribution to the greenhouse gases are:

1. $C{O}_2$ $and$ $C{H}_4$

2. $C{H}_4$ $and$ $$ $N{O}_2$

3. $\mathrm{CFCs}$ $\mathrm{and}$ ${\mathrm{N}}_2\mathrm{O}$

4. $C{O}_2$ $and$ $N_{2}O$

Chipko movement was launched for the protection of:

1. grasslands

2. forests

3. livestock

4. wet lands

Montreal protocol aims at:

1. reduction of ozone depleting substances

2. biodiversity conservation

3. control of water pollution

4. control of CO₂ emission

Biochemical Oxygen Demand (BOD) in river water:

Global agreement in specific control strategies to reduce the release of ozone-depleting substance was adopted by:

1. Rio de Janeiro Conference

2. The Montreal Protocol

3. The Kyoto Protocol

4. The Vienna Convention