Exam (elaborations)
Edexcel AS Level 2022 Biology B PAPER 2: Core Physiology and Ecology
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- AS LEVEL
- Institution
- PEARSON (PEARSON)
Edexcel AS Level 2022 Biology B PAPER 2: Core Physiology and Ecology
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gyiolo
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 GCE
Paper
Time 1 hour 30 minutes
reference 8BI0/02
Biology B
Advanced Subsidiary
PAPER 2: Core Physiology and Ecology
You must have: Total Marks
Scientific calculator, HB pencil, ruler
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 the questions in the spaces provided
– there may be more space than you need.
Information
• The total mark for this paper is 80.
• The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• to question(s)
In marked with an asterisk (*), marks will be awarded for your ability
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.
• Try to answer every question.
• Check your answers if you have time at the end.
Turn over
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©2022 Pearson Education Ltd.
Q:1/1/1/
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2022 xcel B
Answer ALL questions. Write your answers in the spaces provided.
Ede
Some questions must be answered with a cross in a box . If you change your mind about an
answer, put a line through the box and then mark your new answer with a cross .
1 The diagram shows a magnified human red blood cell.
(a) The actual diameter of this cell is 7.20 µm.
Calculate the magnification of this diagram.
(2)
Answer ......................... ............... . . . . . . . . . . . . . . . . . . . . . .
2
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2022 xcel B
(b) A regular sphere with a diameter of 7.20 µm has a surface area of 162.86 µm2.
Ede
(i) Calculate the volume of a sphere with a diameter of 7.20 µm.
4 3
Use the formula V = πr
3 (2)
Answer ...................................... ............... . . . . . . . . . µm3
(ii) Explain how a red blood cell with the same diameter as this sphere enables it
to carry out its functions in transporting gases in the blood.
(3)
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(Total for Question 1 = 7 marks)
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2022 xcel B
2 The biodiversity of habitats can be measured by recording the species present.
Ede
(a) Describe two reasons why biodiversity of habitats should be maintained.
(2)
1 . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................................ . . . . . . . . . . . . . . . . . . . .
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(b) A student investigated the plant species growing in a sand dune habitat.
Plants were identified and counted in two regions, A and B, of the sand dune.
The results for region A are shown in Table 1.
Species Number of individual plants
sea holly 8
sand couch 10
sea bindweed 2
sand dropwort 3
prickly parsnip 7
Table 1
The index of diversity (D) was calculated from the data.
This gave a value of 4.44.
4
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