What are the primary pollutants that directly cause air pollution?

• Carbon monoxide

• Nitrogen dioxide

• Ozone

• Sulphur-dioxide

Which of the following is a man-made cause of global warming?

• Water vapour

• Volcanoes

• Melting permafrost

• Industrial development

What is the main source of oxygen and helps in maintaining environmental balance?

• Vehicles

• Factories

• Mining operations

• Plants

Which of the following is a natural cause of global warming?

• Chlorofluorocarbon

• Deforestation

• Industrial development

• Volcanoes

What is the phenomenon of a gradual increase in the temperature near the earth’s surface called?

• Ozone depletion

• Air pollution

• Acid rain

• Global warming

Which of the following is a secondary pollutant formed by the intermingling of primary pollutants?

• Nitrogen dioxide

• Smog

• Carbon monoxide

• Sulphur-dioxide

What is the main source of carbon monoxide, organic compounds, and chemicals that are released into the air?

• Mining activities

• Agricultural activities

• Automobiles

• Factories and industries

What has led to an incredible increase in earth’s temperature since 1880?

• Deforestation

• Industrial development

• Volcanoes

• Global warming

Which of the following is a negative effect of global warming on biodiversity?

• Threats to the ecosystem

• Rise in temperature

• Spread of diseases

• Climate change

What is the harmful gas emitted during agricultural activities?

• Sulphur-dioxide

• Ozone

• Carbon monoxide

• Ammonia