IGCSE Biology Paper-4: Specimen Questions with Answers 120 - 120 of 120


Carbon dioxide is important greenhouse gases. The effect of human activities in increasing the concentration of greenhouse gases, such as carbon dioxide and methane, is known as the enhanced greenhouse effect.

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Essay Question▾

Describe in Detail

Figure shows the concentrations of carbon dioxide in the atmosphere over past years. Describe the trend in the concentrations of carbon dioxide over the past years.

Image shows global carbon dioxide emission in 1751-2006

Image Shows Global Carbon Dioxide Emission in 1751 - 2006


Above graph shows how atmospheric carbon di oxide levels have dramatically increased in recent years.

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