At some time during your A-level course, you may open your unit test paper and find a question that you can do — not just attempt, but really get your teeth into. It’s a gift! In this issue, we will look at just such a question.
Candidates taking one particular paper last summer must have been pleased when they found that they had to write an essay on the effects of carbon dioxide on living organisms. This was clearly a topic where a lot of candidates felt genuinely confident. They could describe the role of carbon dioxide in photosynthesis; they knew how an increase in carbon dioxide concentration increased the supply of oxygen to rapidly respiring tissues and, of course, they could always add something on global warming…that stuff on melting ice caps and polar bears.
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