IB Biology SL C4.2.15 Primary Production Questions

Primary production is the accumulation of carbon compounds in autotroph biomass. Net primary production is gross production minus respiration. IB Biology SL C4.2.15 covers both relationships.

Exam points

Distinguish gross from net production by accounting for respiration: gross production = net production + respiration.
Interpret net primary production as carbon accumulation in autotroph biomass using supplied ecosystem data.

[Maximum number: 1]

Calculate the gross production of an aquatic ecosystem that has a net primary production of $96 \mathrm{~kJ} \mathrm{~m}^{-2} \mathrm{y}^{-1}$ and a respiration rate of $45 \mathrm{~kJ} \mathrm{~m}^{-2} \mathrm{y}^{-1}$ , giving the units.

$\quad(=96+45)=141 \mathrm{~kJ} \mathrm{~m}^{-2} \mathrm{yr}^{-1}$

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IB Biology SL C4.2.15 Primary Production Questions question 1