The gross primary production of grassland is 21 000 kJ m⁻² year⁻¹. Plants use 12 500 kJ m⁻² year⁻¹ in respiration. Calculate the net primary production.
From Mock A · Paper 2 (topics 5–8)
3.22 marks
Primary consumers in the grassland have a production of 850 kJ m⁻² year⁻¹. Calculate the efficiency of energy transfer from producers (using NPP) to primary consumers.
From Mock A · Paper 2 (topics 5–8)
3.32 marks
Explain one farming practice that increases the efficiency of energy transfer to livestock.
From Mock B · Paper 2 (topics 5–8)
152 marks
Grassland has gross primary production of 20 000 kJ m⁻² year⁻¹ and respiratory losses of 12 000 kJ m⁻² year⁻¹ (data are illustrative, written for this paper). Calculate the net primary production.
From Mock C · Paper 2 (topics 5–8)
3.13 marks
Producers have a net production of 20 000 kJ m⁻² year⁻¹ and primary consumers 1 600 kJ m⁻² year⁻¹ (data are illustrative, written for this paper). Calculate the efficiency of energy transfer and give two reasons why it is low.
From Mock C · Paper 2 (topics 5–8)
3.22 marks
Explain how keeping livestock indoors increases the efficiency of energy transfer.
Score 0 / 13 · 0 of 6 marked
This paper is written by Plasmo in the style of the AQA A-Level Biology exam. It is not a past paper and is not produced or endorsed by the exam board.
Energy and ecosystems Exam Questions: AQA A-Level Biology | Plasmo