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Pearson Edexcel Level 3 GCE
Wednesday 19 June 2024
Morning (Time: 2 hours) Paper
reference 9BN0/03
Biology A (Salters Nuffield) ■ ■
Advanced
PAPER 3: General and Practical Applications in Biology
You must have: Ruler, HB pencil, scientific calculator and a copy Total Marks
of the scientific article adapted from the New Scientist and the
Brazilian Journal of Medical and Biological Research (enclosed)
Pearson Edexcel Level 3 GCE Advanced PAPER 3: General and Practical Applications in Biology QP JUNE
2024
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• The total mark for this paper is 100.
• The marks for each question are shown in brackets
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• Instructure
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Turn over
(c) Another role of IAA is to stimulate the growth of lateral roots.
The diagram shows the roots of thale cress.
lateral roots
DO NOT WRITE IN THIS AREA
main root
3
■■■■ Turn over
, One type of receptor for IAA is coded for by the tir1 gene.
Scientists have investigated the effect of IAA on the growth of lateral roots in
DO NOT WRITE IN THIS AREA
thale cress.
Plants homozygous for a normal tir1 gene and plants homozygous for a mutation
in the tir1 gene were used in this investigation.
The plants were treated with different concentrations of IAA.
The mean number of lateral roots produced per mm of main root was recorded.
The graph shows the results of this investigation.
Key
1.6 Thale cress
homozygous for:
1.4
1.2 normal
tir1 gene
Mean number of 1.0
lateral roots per mm mutant
DO NOT WRITE IN THIS AREA
0.8 tir1 gene
0.6
0.4
0.2
0.0
0.00 0.01 0.10 1.00
IAA concentration / μmol dm–3
(i) Explain why the scientists used plants homozygous for the normal and the
mutant tir1 gene in this investigation.
(2)
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