Exam (elaborations)
A-LEVEL EDEXCEL BIOLOGY PAPER 3 June 2024 Question Paper (9BN0/03)
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A-LEVEL EDEXCEL BIOLOGY PAPER 3 June 2024 Question Paper (9BN0/03)
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Please check the examination details below before entering your candidate informationCandidate surname Other names
Centre Number Candidate Number
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 Total Marks
copy
of the scientific article adapted from the New Scientist
and the Brazilian Journal of Medical and Biological
Research (enclosed)
Instructions
•• Use black ink or ball-point pen.
Fill in the boxes at the top of this page with your
centre
name, number and candidate number.
• Answer all
• Show all your working out in calculations and include units where appropriate.
questions.
• Answer the questions in the spaces provided
– there may be more space than you need.
Information
• The
• The
total mark for this paper is 100.
marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• Inyourquestions marked with an asterisk (*), marks will be awarded for
ability to structure your answer logically, showing how the points that
you make are related or follow on from each other where appropriate.
Advice
•• Read each question carefully before you start to answer it.
• Check
Try to answer every
your answers if you have time at the end.
question.
Turn over
P74458RA
©2024 Pearson Education Ltd.
F:1/1/1/1/1/1/1/1/1/1/
, Answer ALL questions.
Write your answers in the spaces provided.
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1 One of the first plant species to colonise some habitats is
thale cress (Arabidopsis thaliana).
The plant hormone IAA (auxin) is produced in the growing tips of
plants such as thale cress.
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(Source: Nigel Cattlin / Alamy Stock Photo)
(a) State what is meant by the term colonisation of a habitat.
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, (b) One role of IAA is to stimulate the phototropic response of
shoots. Describe how IAA causes a phototropic response in
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the shoots of a plant.
(3)
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(c) Another role of IAA is to stimulate the growth of
lateral roots. The diagram shows the roots of
thale cress.
lateral roots
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main root
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, One type of receptor for IAA is coded for by the tir1 gene.
Scientists have investigated the effect of IAA on the growth of
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lateral roots in 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. Thale cress
6 homozygous
for:
1.
4 normal
Mean number
1. tir1
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of lateral roots
2 gene
per mm
1. mutant
0 tir1
gene
0.
8
0. 0.00 0.01 0.10 1.00
6 IAA concentration / μmol dm–3
0.
4
0.
2
0.
0
(i) Explain why the scientists used plants homozygous for the
normal and the mutant tir1 gene in this investigation.
(2)
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