Discussion
Grain respires at \( 0.8 \) mg of carbon dioxide per kg per day. From \( 250 \) tonnes the daily output is
Answer: C
Correct answer: 200 g
Multiply the specific respiration rate by the mass, watching the units:
\[ 0.8\ \mathrm{mg/kg/day} \times 250\,000\ \mathrm{kg} = 200\,000\ \mathrm{mg} = 200\ \mathrm{g\ per\ day} \]
This is a low rate, typical of sound dry grain, and it is precisely why carbon dioxide monitoring is such a sensitive early warning: a developing wet pocket or insect focus raises the figure many times over long before anything is visible or the temperature probes respond.
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