Question Answers Extra information Mark AO /
Spec. Ref.
01.1 primary consumer 1 AO2
4.7.2.1
4.7.4.1
01.2 correct shape: 4 tiers with
largest at bottom and smallest
at top
correctly labelled:
dragonfly / nymph
+
...
Question Answers Extra information Mark AO /
Spec. Ref.
01.1 primary consumer 1 AO2
4.7.2.1
4.7.4.1
01.2 correct shape: 4 tiers with
largest at bottom and smallest
at top
correctly labelled:
dragonfly / nymph
+ hydra
+ daphnia
+ algae
in this order
or allow:
3rd-order or tertiary consumer or
apex / top predator or (trophic
level) 4
2nd-order or secondary
consumer or (trophic level) 3
1st-order or primary consumer or
herbivore or (trophic level) 2
producer or (trophic level) 1
allow for 2 marks inverted
pyramid if correctly labelled
1
1
AO2
4.7.4.2
01.3 any one from:
(Daphnia biomass smaller
because)
• non-digestible parts (of
algae) or lost in faeces
• not all absorbed
• lost in urine / urea
• used in respiration or lost
as carbon dioxide / CO2
• algae not all eaten
or eaten by other
organisms
• some algae decompose
ignore waste
allow excretion
allow (to supply energy) for
movement / warmth
allow used to supply energy
1 AO1
4.7.4.3
01.4
14
14 000
an answer of 14 000 scores
2 marks
allow evidence of an incorrectly
calculated mean × 1000
allow 1.4 × 104
1
1
AO2
4.7.2.1
7
MARK SCHEME – GCSE BIOLOGY – 8461/2H – JUNE 2019
Question Answers Extra information Mark AO /
Spec. Ref.
01.5
(volume of pond = )
1.875
or 2.5 × 1.5 × 0.5
14 000 × 1.875
26250
2.625 × 104
an answer of 2.625 × 104
or 2.63 × 104
or 2.6 × 104 scores 4 marks
an answer of 26250 scores 3
marks
allow ecf from Question 01.4
an incorrect answer for one step
does not prevent allocation of
marks for subsequent steps
allow ecf from Question 01.4
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