8 Biology page 9-10

What process helps keep oxygen and carbon dioxide levels steady in a balanced ecosystem?

• Transpiration

• Photosynthesis

• Evaporation

• Condensation

What has contributed to the increase in carbon dioxide levels in the atmosphere?

• Reducing waste

• Using renewable energy

• Planting more trees

• Industrialisation

What is the effect of deforestation on carbon dioxide levels?

• Increases absorption of carbon dioxide

• Has no effect on carbon dioxide levels

• Reduces the number of trees to absorb carbon dioxide

• Decreases carbon dioxide levels

What is carbon dioxide referred to as due to its insulating properties?

• Nutrient

• Greenhouse gas

• Ozone

• Pollutant

By how much has the Earth's average temperature risen since before industrialisation?

• 0.5°C

• 3°C

• 1°C

• 2°C

What is one of the serious effects of global warming mentioned in the text?

• More stable weather patterns

• Rising land and ocean temperatures

• Increased tree growth

• Decreased rainfall

What phenomenon is caused by the increase of greenhouse gases?

• Global cooling

• Global flooding

• Global freezing

• Global warming

What is happening to ice at the Earth's poles due to global warming?

• It is turning into freshwater

• It is becoming thicker

• It is melting

• It is increasing

What is one of the extreme weather conditions mentioned as a result of global warming?

• Calm seas

• Hurricanes

• Stable climates

• Mild winters

What is the current rate of temperature rise per decade?

• 0.1°C

• 0.2°C

• 0.5°C

• 1°C