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EDEXCEL JUNE 2024 A LEVEL BIOLOGY A PAPERS AND MARKSCHEMES COMBINED MERGED
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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
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centre number and candidate number.
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•• The total mark for this paper is 100.
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P74456A
©2024 Pearson Education Ltd.
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*P74456A0128*
, Answer ALL questions. Write your answers in the spaces provided.
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answer, put a line through the box and then mark your new answer with a cross .
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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