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The pie chart shows the causes of death of people who smoked tobacco - Edexcel - GCSE Biology - Question 2 - 2013 - Paper 1
Question 2
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The pie chart shows the causes of death of people who smoked tobacco.
People who smoke tobacco are most likely to die from
A chronic bronchitis and emphyse... show full transcript
Worked Solution & Example Answer:2
The pie chart shows the causes of death of people who smoked tobacco - Edexcel - GCSE Biology - Question 2 - 2013 - Paper 1
Step 1
People who smoke tobacco are most likely to die from
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Answer
C cancer
Step 2
Calculate how many of these people died from chronic bronchitis and emphysema.
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Answer
Chronic bronchitis and emphysema account for 20% of the 5000 people. Therefore, the number of people who died from these conditions is:
5000×0.20=1000
So, 1000 people died from chronic bronchitis and emphysema.
Step 3
Explain how smoking tobacco can cause cancer.
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Answer
Smoking tobacco contributes to cancer through the presence of tar. Tar is a carcinogen which can lead to mutations in the DNA of cells. This process disrupts normal cell function and regulation, potentially leading to cancer development.
Step 4
Caffeine is a type of drug.
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Answer
D stimulant
Step 5
Describe the effect caffeine can have on the human body.
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Answer
Caffeine acts as a stimulant, increasing alertness and reducing fatigue. It works by blocking the action of adenosine, a brain chemical involved in sleep. Additionally, caffeine can enhance mood and improve concentration, although excessive intake may lead to anxiety and restlessness.
