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Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Friday 19 January 2024
Morning (Time: 1 hour 20 minutes) Paper
reference WBI13/01
Biology
International Advanced Subsidiary/Advanced Level
UNIT 3: Practical Skills in Biology I
You must have: Total Marks
Scientific calculator, ruler, HB pencil
Instructions
•• Use black ink or ball‑point pen.
Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
Information
•• The total mark for this paper is 50.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
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.
, Answer ALL questions.
Write your answers in the spaces provided.
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1 Vitamin C is a dietary antioxidant.
Spinach is a plant that produces edible leaves with a high vitamin C content.
(a) Explain the link between dietary antioxidants and the risk of
cardiovascular disease (CVD).
(3)
, (b) The vitamin C content of the leaves from spinach plants was investigated.
Describe how comparative measurements of the vitamin C content of the leaves
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, (c) The effect of soil type and season on the vitamin C content of spinach plants
was investigated.
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The table shows some data from spinach grown in the two soil types, in spring
and autumn.
Vitamin C content of leaves / mg g–1
Spring Autumn
Soil type 1 Soil type 2 Soil type 1 Soil type 2
Mean 0.49 0.73 0.59 0.95
Standard deviation ± 0.07 ± 0.09 ± 0.06
(i) The table shows the data required to calculate the missing standard deviation
for the spinach grown in soil type 2 in the autumn.
(x – x )2
0.031
0.009
0.031
0.004
0.013
0.006
0.001
0.024
0.000
0.024
0.055
0.002
4
*P75591A0416*
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