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QUESTION 6 The abiotic factor limiting the carrying capacity of an Atlantic salmon farm is low (A) dissolved oxygen. (B) temperature. (C) ammonia. (D) nitrites.
QUESTION 17 Coral reef growth occurs when the (A) dissolution rate is the same as the calcification rate. (B) calcification rate is less than the destruction processes. (C) accretion rate is greater than the dissolution and erosion rates. (D) dissolution and erosion rates are greater than the accretion rate.
QUESTION 18 An increase in which factor would likely prevent a coral-dominated reef system from phase-shifting into an algae-dominated system after a mass bleaching event? (A) sediment run-off (B) severe weather events (C) sea cucumber numbers (D) herbivorous fish numbers
QUESTION 7 (11 marks) The graph shows Australian prawn production by sector from 2006-07 to 2026-27. a) Identify the financial year in the historical data when wild caught prawn production had the highest economic value. [1 mark] b) Describe the trend in total economic value for Australian prawns from 2016-17 to 2021-22. Suggest two possible reasons for this trend. [3 marks] c) Compare the historical and predicted economic value of Australian prawns. [3 marks] Similarity: Difference: Significance: d) Explain two attributes that make prawns a desirable species to farm. [4 marks]
Difficulty: A
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Paper 2
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2023
QUESTION 24 Under experimental conditions the blue mussel Mytilus edulis was exposed to five treatment conditions. 0.7 o 06 E g 0.5 o g 04 % 0.3 2 o2 » c S 0.1 S 0 12°C&pH8 12°C&pH7.8 12°C&pH76 16°C&pH8 14°C&pH7.6 Treatment From the figure above which factor causes the greatest negative impact on the mean shell surface area? (A) 14°C (B) 16°C (C) pH7.6 (D) pH7.8
QUESTION 34 (3 marks) A laboratory investigation was conducted into the effect of altering ocean pH on marine carbonate structures. Mean pH. 7.1 pH 7.3 pH 7.6 pH 7.9 9 o - o | - o Net calcification (mg CaCO g' d™') Infer which species’ marine carbonate structural development would be most affected by a reduction in ocean pH. Give reasons for your response.
QUESTION 9 (2 marks) a) Identify one point of difference between small-scale ocean acidification studies in aquaria and those conducted in the field. [1 mark] b) Identify what aquaria-based experiments demonstrate about ocean acidification. [1 mark]
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