Your text here 1
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
AS
BIOLOGY
Paper 2
Friday 22 May 2020 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have: For Examiner’s Use
a ruler with millimetre measurements
a scientific calculator. Question Mark
1
Instructions 2
Use black ink or black ball-point pen.
3
Fill in the boxes at the top of this page.
Answer all questions. 4
You must answer the questions in the spaces provided. Do not write 5
outside the box around each page or on blank pages.
6
If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). 7
Show all your working. 8
Do all rough work in this book. Cross through any work you do not want 9
to be marked.
TOTAL
Information
The marks for the questions are shown in brackets.
The maximum mark for this paper is 75.
*JUN207401201*
IB/M/Jun20/E15 7401/2
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Littorina littorea is a species of snail found on rocky sea shores.
A student investigated variation in snail shell height in two populations of snails.
Give two ways in which the student could ensure his samples would provide a reliable
measure of the variation between individuals in each population.
[2 marks]
1
2
0 1 . 2 The student could determine the median, mode and range from his measurement of
shell heights in these populations.
Give two other statistical values the student could calculate from his measurement of
shell heights in these populations.
[1 mark]
1
2
0 1 . 3 Name the taxon in the hierarchy of classification represented by:
[1 mark]
1 Littorina
2 Iittorea
*02*
IB/M/Jun20/7401/2
, 3
Do not write
outside the
box
0 1 . 4 The student noticed there was a difference in shell height between these populations
of snails. He wanted to investigate if the difference was significant.
Give a suitable null hypothesis to use in his investigation and name the statistical test
to use with these data.
[2 marks]
Null hypothesis
Statistical test
6
Turn over for the next question
*03*
IB/M/Jun20/7401/2
, 4
Turn over ► Do not write
outside the
*03*
IB/M/Jun20/7401/2
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
AS
BIOLOGY
Paper 2
Friday 22 May 2020 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have: For Examiner’s Use
a ruler with millimetre measurements
a scientific calculator. Question Mark
1
Instructions 2
Use black ink or black ball-point pen.
3
Fill in the boxes at the top of this page.
Answer all questions. 4
You must answer the questions in the spaces provided. Do not write 5
outside the box around each page or on blank pages.
6
If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). 7
Show all your working. 8
Do all rough work in this book. Cross through any work you do not want 9
to be marked.
TOTAL
Information
The marks for the questions are shown in brackets.
The maximum mark for this paper is 75.
*JUN207401201*
IB/M/Jun20/E15 7401/2
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Littorina littorea is a species of snail found on rocky sea shores.
A student investigated variation in snail shell height in two populations of snails.
Give two ways in which the student could ensure his samples would provide a reliable
measure of the variation between individuals in each population.
[2 marks]
1
2
0 1 . 2 The student could determine the median, mode and range from his measurement of
shell heights in these populations.
Give two other statistical values the student could calculate from his measurement of
shell heights in these populations.
[1 mark]
1
2
0 1 . 3 Name the taxon in the hierarchy of classification represented by:
[1 mark]
1 Littorina
2 Iittorea
*02*
IB/M/Jun20/7401/2
, 3
Do not write
outside the
box
0 1 . 4 The student noticed there was a difference in shell height between these populations
of snails. He wanted to investigate if the difference was significant.
Give a suitable null hypothesis to use in his investigation and name the statistical test
to use with these data.
[2 marks]
Null hypothesis
Statistical test
6
Turn over for the next question
*03*
IB/M/Jun20/7401/2
, 4
Turn over ► Do not write
outside the
*03*
IB/M/Jun20/7401/2
