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Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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12 questions

SA-AB-EC-0121 markL1 FoundationCalculatorSuccession and climate

The main gas responsible for the enhanced greenhouse effect from fossil fuels is

Salam Academy Original Practice · Proposed mark scheme

SA-AB-EC-0012 marksL2 StandardCalculatorEnergy transfer

GPP = 20 000 kJ m⁻² yr⁻¹ and respiratory loss = 12 000. Calculate NPP.

Salam Academy Original Practice · Proposed mark scheme

SA-AB-EC-0022 marksL2 StandardCalculatorEnergy transfer

Producers have 8000 kJ m⁻² yr⁻¹ available; herbivores gain 800. Calculate the efficiency of transfer (%).

Salam Academy Original Practice · Proposed mark scheme

SA-AB-EC-0041 markL2 StandardCalculatorNutrient cycles

Nitrogen fixation converts

Salam Academy Original Practice · Proposed mark scheme

SA-AB-EC-0051 markL2 StandardCalculatorNutrient cycles

Nitrification is carried out by

Salam Academy Original Practice · Proposed mark scheme

SA-AB-EC-0061 markL2 StandardCalculatorNutrient cycles

Denitrification is favoured by

Salam Academy Original Practice · Proposed mark scheme

SA-AB-EC-0071 markL2 StandardCalculatorNutrient cycles

In eutrophication, fish die mainly because

Salam Academy Original Practice · Proposed mark scheme

SA-AB-EC-0081 markL2 StandardCalculatorNutrient cycles

Mycorrhizae help plants by

Salam Academy Original Practice · Proposed mark scheme

SA-AB-EC-0091 markL2 StandardCalculatorSuccession and climate

Pioneer species are able to colonise bare rock because they

Salam Academy Original Practice · Proposed mark scheme

SA-AB-EC-0101 markL2 StandardCalculatorEnergy transfer

Keeping livestock indoors in warm pens increases efficiency because

Salam Academy Original Practice · Proposed mark scheme

SA-AB-EC-0111 markL2 StandardCalculatorSuccession and climate

During succession, biodiversity generally

Salam Academy Original Practice · Proposed mark scheme

SA-AB-EC-0032 marksL3 ExamCalculatorEnergy transfer

A cow ingests 3000 kJ; 1800 kJ are lost in faeces and urine, 900 kJ in respiration. Calculate its net production (kJ).

Salam Academy Original Practice · Proposed mark scheme