AQA_Biology_2019_Paper_2_Higher_Tier_Mark_Scheme.pdf

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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 [Show More]

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