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Please check the examination details below before entering your candidate information
2022 xcel B
Candidate surname Other names
Ede
Centre Number Candidate Number
Pearson Edexcel Level 3 GCE
Paper
Time 2 hours
reference 9BN0/03
Biology A (Salters Nuffield)
Advanced
PAPER 3: General and Practical Applications in Biology
You must have: Total Marks
Ruler, HB pencil and scientific calculator and a copy of the
scientific article adapted from Scientific American (enclosed)
Instructions
• Fill
Use black ink or ball-point pen.
• centrein the boxes at the top of this page with your name,
number and candidate number.
• Answer all questions.
• Answer
Show all your working out in calculations and include units where appropriate.
• – there maythe questions in the spaces provided
be more space than you need.
Information
• The total mark for this paper is 100.
• The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• You may use a scientific calculator.
• structure
In questions marked with an asterisk (*), marks will be awarded for your ability to
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.
• Try to answer every question.
• Check your answers if you have time at the end.
Turn over
Write your answers in the spaces provided.
1 When oat seeds germinate, they produce roots and a coleoptile.
(a) The effect of shading the tip of the coleoptile was investigated.
The diagram shows how the coleoptile of an oat seedling can bend towards light.
angle of
coleoptile curvature
1 cm
seed
direction
of light
roots
in the dark illuminated for 2 hours
Oat seeds were germinated. When the coleoptiles were 2 cm long the seedlings
were split into three groups.
• Group 1 none of the tip of the coleoptile was shaded
• Group 2 5 mm at the tip of the coleoptile was shaded
• Group 3 10 mm at the tip of the coleoptile was shaded
All the coleoptiles were then exposed to light from one side.
The curvature of the coleoptiles was measured after intervals of 2 hours and
3 hours.
The results of this investigation are shown in the graph.
35
30
25
Mean angle
20 Key
of curvature
of coleoptiles 2 hours
15
/ degrees
10 3 hours
5
0
0 5 10
Length of coleoptile tip shaded / mm
2
*P67092RA0228*
, gy
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2022 xcel B
(i) Describe two conclusions that can be drawn from the results of
this investigation.
Ede
(ii) The results of this investigation were analysed using the Student’s t-test.
A p value of 0.05 was used to interpret the results of the t-test.
Explain what a p value of 0.05 means.
(2)
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