Non-smokers who breathe in the smoke exhaled by the smokers:

1. Secondary smokers
2. Active smokers
3. Passive smokers
4. Indirect smokers

The buried, combustible deposits of organic materials, formed as a result of heat and pressure in the earth's crust over hundreds of millions of years:

1. Fossil
2. Fossil Fuel
3. Crude
4. Combustions

The major disadvantage of fossil fuels is:

1. Water Pollution
2. Radioactive Pollution
3. Air Pollution
4. Soil Pollution

A holistic system of farming, which is primarily aimed at cultivating the land and raising crops in such a way, as to keep the soil alive and in good health in an eco-friendly pollution free environment.

1. Eco-friendly farming
2. Organic Farming
3. Primary farming
4. Preventive farming