IGCSE Carbon Cycle & Greenhouse Effect

Which process(es) release carbon dioxide into the atmosphere?

• respiration

• combustion

• photosynthesis

• feeding

Which process(es) take carbon dioxide out of the atmosphere?

• respiration

• combustion

• photosynthesis

• feeding

What type of organism receives carbon present in dead plants and animals?

• producer

• primary consumer

• secondary consumer

• decomposer

Which of the following is/are greenhouse gases?

• carbon dioxide

• water vapour

• methane

• nitrogen

Which of the following is/are true of greenhouse gases?

• They absorb sunlight

• They form the ozone layer

• They absorb heat energy

• They absorb long-wave radiation

Which is true of Earth's surface?

• It reflects most sunlight that hits it as light energy

• It re-emits sunlight as short-wave radiation

• It reflects most sunlight that hits it as heat energy

• It re-emits sunlight as long-wave radiation

Which of the following is true of The Greenhouse Effect?

• It is a completely natural process

• It is an artificial process that has been naturally speeded up by humans

• It is a natural process that has been artificially speeded up by humans

• It is a completely artificial process