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Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel Level 3 GCE
Wednesday 5 June 2024
Afternoon (Time: 2 hours) Paper
reference 9BN0/01
Biology A (Salters Nuffield)
Advanced
PAPER 1: The Natural Environment and Species
Survival
You must have: Total Marks
Calculator, HB pencil, ruler
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.
Show all your working out in calculations and include units where appropriate.
• Answer the questions in the spaces provided
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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.
In questions marked with an asterisk (*), marks will be awarded for your ability to
structure your answer logically showing how the points that you make are related or
follow on from each other where appropriate.
Advice
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Try to answer every question.
• Check your answers if you have time at the end.
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1 Silver Springs is an ecosystem in Florida.
Energy flow through this ecosystem has been studied.
The value for the light energy entering this ecosystem is 7 112 800 kJ m–2 yr–1.
The gross primary productivity (GPP) for this ecosystem is 87 069 kJ m–2 yr–1.
The value for respiration (R) in this ecosystem is 55 195 kJ m–2 yr–1.
(a) (i) Which of the following is the correct value for the net primary productivity
(NPP) in this ecosystem?
(1)
A 7 025 731 kJ m–2 yr–1
B 697 036 kJ m–2 yr–1
C 142 264 kJ m–2 yr–1
D 31 874 kJ m–2 yr–1
(ii) The table shows some information on trophic levels in this ecosystem.
Energy intake Energy fixed as biomass
Trophic level
/ kJ m–2 yr–1 / kJ m–2 yr–1
Primary consumers 14 092 4 615
Secondary consumers 1 602 464
Tertiary consumers 88 21
2
*P74456A0228*
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