Discussion
Match each storage problem in List I with its usual cause in List II.
List I
A. Crusting on the top surface
B. Resistant insect population
C. Rapid mould growth
D. Blocked airflow through the bulk
List II
1. Repeated sublethal fumigation in a leaky structure
2. Moisture migration by convection
3. Fines and broken grain not cleaned out before storage
4. Equilibrium relative humidity above about 70 per cent
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-4, D-3
Each problem is matched to its usual cause. Crusting on the top surface (A) comes from moisture migration by convection (2), which deposits moisture on the cold surface layer. A resistant insect population (B) comes from repeated sublethal fumigation in a leaky structure (1), which selects for the least susceptible survivors.
Rapid mould growth (C) comes from an equilibrium relative humidity above about 70 per cent (4), the mould threshold. Blocked airflow (D) comes from fines and broken grain not cleaned out before storage (3), which pack into the spaces between kernels.
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