Environment and Ecosystems

What is the main gas in the air we breathe?

• Oxygen

• Nitrogen

• Carbon dioxide

• Helium

Which gas do plants use to make food?

• Oxygen

• Nitrogen

• Carbon dioxide

• Argon

Which gas is needed for respiration?

• Oxygen

• Carbon dioxide

• Methane

• Neon

What happens if there are fewer trees on Earth?

• More oxygen

• Less oxygen and more carbon dioxide

• More rain

• Cleaner air

Which of the following adds harmful gases to the air?

• Planting trees

• Burning fossil fuels

• Collecting rainwater

• Recycling

What process changes water from liquid to vapour?

• Evaporation

• Condensation

• Precipitation

• Runoff

What happens during condensation?

• Water changes to ice

• Water vapour cools and becomes liquid

• Plants lose water

• Water flows into rivers

Which process adds water vapour from plants into the air?

• Collection

• Evaporation

• Condensation

• Transpiration

Rain is part of which water cycle stage?

• Transpiration

• Precipitation

• Runoff

• Condensation

What happens after rainfall that doesn’t soak into the soil?

• It evaporates immediately

• It turns into gas

• It runs into rivers or oceans

• It causes condensation