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Carbon dioxide and sulfur dioxide are air pollutants - Edexcel - GCSE Biology - Question 1 - 2018 - Paper 1
Question 1
Carbon dioxide and sulfur dioxide are air pollutants. The table shows the mass of carbon dioxide added to and removed from the atmosphere per year by three processe... show full transcript
Worked Solution & Example Answer:Carbon dioxide and sulfur dioxide are air pollutants - Edexcel - GCSE Biology - Question 1 - 2018 - Paper 1
Step 1
Calculate the overall change in the mass of carbon dioxide in the atmosphere per year.
Answer
To calculate the overall change in the mass of carbon dioxide in the atmosphere, we need to sum the amounts added and subtract the amounts removed.
For the processes:
- Process X: +140 tonnes (added), -0 tonnes (removed)
- Process Y: +20 tonnes (added), -0 tonnes (removed)
- Process Z: +0 tonnes (added), -135 tonnes (removed)
Overall change = (140 + 20 + 0) - (0 + 0 + 135) = 160 - 135 = 25 tonnes.
Thus, the overall change in the mass of carbon dioxide in the atmosphere per year is 25 tonnes.
Step 2
Complete the sentence by putting a cross (X) in the box next to your answer.
Answer
Process X occurs in animals, plants, and bacteria and is related to respiration, which is the process by which living organisms convert glucose and oxygen into energy, releasing carbon dioxide in the process. Therefore, the correct answer is D) respiration.