Biology · Oct / Nov 2020 · Paper 21 · Question 4
5090
As printed in the paper
The question as text
The diagram shows two identical cigarettes before they have been smoked. In one of them, the paper round the filter has been torn away to expose the filter beneath. It also shows a cigarette after it has been smoked, again with its filter exposed. before after filter white in colour filter brown in colour paper torn away to xpose filter Tar is the chemical which turns the filter brown in colour.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
4(a)[2]
4(b)(i)[4]
4(b)(ii)[4]
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