1. Surname Initial(s)
Centre
Paper Reference
No.
Signature
Candidate
No. 6 1 0 6 0 2
Paper Reference(s)
6106/02 W2 Examiner’s use only
Edexcel GCE Team Leader’s use only
Biology
Biology (Human) Question Leave
Number Blank
Advanced 1
2
Unit Test 6 Paper 02 W2
Tuesday 22 May 2007 – Afternoon
Time: 1 hour 20 minutes
Materials required for examination Items included with question papers
Ruler Nil
Instructions to Candidates
In the boxes above, write your centre number, candidate number, your surname, initial(s) and
signature.
The paper reference is shown above.
Check that you have the correct question paper.
Answer BOTH questions in the spaces provided in this booklet.
Show all the steps in any calculations and state the units. Calculators may be used.
Include diagrams in your answers where these are helpful.
Information for Candidates
The marks for individual questions and parts of questions are shown in round brackets: e.g. (2).
The total mark for this paper is 32.
Advice to Candidates
You must ensure that your answers to parts of questions are clearly numbered.
You will be assessed on your ability to organise and present information, ideas, descriptions and
arguments clearly and logically, taking account of your use of grammar, punctuation and spelling.
Total
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3. Answer BOTH questions.
Write your answers in the spaces provided.
1. Marram grass (Ammophila arenaria) is a grass-like plant which grows in the soft sand
of dunes close to the sea. It grows through the sand by means of horizontal underground
stems. These stems have swellings at intervals which are called nodes. The distance
between two nodes is called an internode as shown in the drawing below.
Leaf
Underground Surface of
stem sand dune
First internode Node
Sand dunes are affected by strong winds which move the sand and bury the stems of
Marram grass. Where the effect of wind is stronger the stems are buried deeper and they
grow faster, making the internodes longer.
A student formed the hypothesis that the first internodes on the stems of Marram grass
would be longer on the windward (exposed) side of dunes, compared to those on the
sheltered side.
To test this hypothesis she measured the length of the first internodes on underground
stems from carefully controlled samples on each side of two dunes.
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An extract from her field note book is shown below.
First internode length in mm
Dune 1
Sheltered
70, 36, 90, 10, 50, 90, 40, 52
Windward
80, 107, 82, 97, 70, 74, 115, 60
Dune 2
Sheltered
41, 84, 29, 31, 37, 56, 41, 62
Windward
108, 110, 79, 71, 50, 92, 82, 61
(a) Prepare a table of raw data and organise it in such a way that the distribution of size
classes of first internode lengths on the windward side of the dune can be compared
with those on the sheltered side.
(3)
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(b) Use the data in your table to present the information in a suitable graphical form.
(4)
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(c) Comment on the variability shown by these data.
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(1)
(d) The student applied a t-test to her data in order to test this hypothesis.
She calculated the value of t to be 4.09.
The table below shows the critical values of t with 30 degrees of freedom at different
significance levels.
Significance level (p) 0.2 0.1 0.05 0.02 0.01 0.001
Critical value of t 1.31 1.70 2.04 2.46 2.75 3.65
What conclusions can be drawn from this investigation? Use the information provided
to explain your answer.
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(3) Q1
(Total 11 marks)
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2. A student observed honeybees that were visiting flowers to collect nectar (a sugary
product from flowers). He noticed that they showed a preference for collecting nectar
from flowers of a particular colour.
Design an investigation, which you could personally carry out in the laboratory or field, to
test the hypothesis that when collecting nectar, honeybees are able to recognise colour.
Your answer should be given under the following headings.
(a) Plan of the investigation to be carried out.
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(b) Recording of raw data measurements, presentation of results and methods of data
analysis.
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(c) Limitations of your method and an indication of further work that could be undertaken
to provide additional evidence for your conclusions.
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(5) Q2
(Total 21 marks)
TOTAL FOR PAPER: 32 MARKS
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