Allied & ICAR Exam Bank • ALLIED_1330 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Refrigeration and Freezing

Subtopic: Controlled Atmosphere Storage

Question Statement:

In Controlled Atmosphere (CA) cold storage of apples, fruit respiration is retarded by:

Options:

  • (A) Lowering oxygen (1% to 3%) and elevating carbon dioxide (1% to 2%) at low temperature (0 to 2 deg C)
  • (B) Replacing all air with 100% pure oxygen
  • (C) Storing at -20 deg C under high vacuum
  • (D) Flooding the room with ethylene gas

Answer Key:

A

Step-by-Step Solution & Explanation

CA storage depresses metabolic respiration and ethylene synthesis by maintaining reduced $O_2$ ($1-3\%$) and controlled $CO_2$ ($1-2\%$), extending fresh apple storage to 9-12 months.
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