Explain how burning fossil fuels can lead to damage to trees and other plants.
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Model answer (4 marks)
Burning fossil fuels releases sulphur dioxide and nitrogen oxides into the atmosphere. These gases dissolve in water vapour and form sulphuric and nitric acids, which fall as acid rain. When acid rain contacts leaves it dissolves the waxy cuticle and damages the leaf tissue, reducing photosynthesis and sometimes killing the leaf. The acid also leaches essential minerals from the soil, lowering the pH and making nutrients unavailable to the plant; this can damage roots and further inhibit growth.
Examiner tips
- Use the exact terms "sulphur dioxide", "nitrogen oxides", "acid rain", "waxy cuticle" and "leaching of minerals"
- Show the causal chain: fuel combustion → gases → acid rain → leaf damage and soil acidification
Common mistakes
- Mixing up sulphur dioxide with carbon dioxide
- Forgetting to mention the cuticle or the leaching of nutrients
- Using UK spelling incorrectly (e.g., "sulfur" instead of "sulphur")
Mark scheme (4 marks)
- Burning fossil fuels releases sulfur dioxide / nitrogen oxides into the atmosphere
- These gases dissolve in water / rain to form acid rain
- Acid rain damages / kills leaves or destroys the waxy cuticle of leaves
- Acid rain makes soil more acidic, leaching minerals / nutrients from the soil so plants cannot absorb them / roots are damaged
Key terms in this question
Related
- All Eduqas GCSE Biology revision notes →
- How to answer a "Explain" question →
- Decode the mark scheme abbreviations →
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